ci(kitchen+travis): adjust matrix to add `3000.2` & remove `2018.3`

* Semi-automated using https://github.com/myii/ssf-formula/pull/166

.travis.yml

     ## Define the rest of the matrix based on Kitchen testing
     # Make sure the instances listed below match up with
     # the `platforms` defined in `kitchen.yml`
-    - env: INSTANCE=v3000-py3-debian-10-3000-1-py3
-    - env: INSTANCE=v3000-py3-ubuntu-1804-3000-1-py3
-    - env: INSTANCE=v3000-py3-centos-8-3000-1-py3
-    - env: INSTANCE=v3000-py3-fedora-31-3000-1-py3
-    # - env: INSTANCE=v3000-py3-opensuse-leap-151-3000-1-py3
-    - env: INSTANCE=v3000-py3-amazonlinux-2-3000-1-py3
-    # - env: INSTANCE=v3000-py2-arch-base-latest-3000-1-py2
+    - env: INSTANCE=v3000-py3-debian-10-3000-2-py3
+    # - env: INSTANCE=v3000-py3-debian-9-3000-2-py3
+    # - env: INSTANCE=v3000-py3-ubuntu-1804-3000-2-py3
+    - env: INSTANCE=v3000-py3-centos-8-3000-2-py3
+    # - env: INSTANCE=v3000-py3-centos-7-3000-2-py3
+    - env: INSTANCE=v3000-py3-fedora-31-3000-2-py3
+    # - env: INSTANCE=v3000-py3-opensuse-leap-151-3000-2-py3
+    - env: INSTANCE=v3000-py3-amazonlinux-2-3000-2-py3
+    - env: INSTANCE=v3000-py2-ubuntu-1804-3000-2-py2
+    # - env: INSTANCE=v3000-py2-ubuntu-1604-3000-2-py2
     # - env: INSTANCE=v201902-py3-debian-10-2019-2-py3
     - env: INSTANCE=v201902-py3-debian-9-2019-2-py3
     # - env: INSTANCE=v201902-py3-ubuntu-1804-2019-2-py3
+    - env: INSTANCE=v201902-py3-ubuntu-1604-2019-2-py3
     # - env: INSTANCE=v201902-py3-centos-8-2019-2-py3
+    - env: INSTANCE=v201902-py3-centos-7-2019-2-py3
+    # - env: INSTANCE=v201902-py3-fedora-31-2019-2-py3
     - env: INSTANCE=v201902-py3-opensuse-leap-151-2019-2-py3
     # - env: INSTANCE=v201902-py3-amazonlinux-2-2019-2-py3
-    - env: INSTANCE=v201902-py2-ubuntu-1804-2019-2-py2
-    # - env: INSTANCE=v201902-py2-centos-7-2019-2-py2
-    # - env: INSTANCE=v201902-py2-arch-base-latest-2019-2-py2
-    # - env: INSTANCE=v201803-py2-debian-9-2018-3-py2
-    - env: INSTANCE=v201803-py2-ubuntu-1604-2018-3-py2
-    - env: INSTANCE=v201803-py2-centos-7-2018-3-py2
-    # - env: INSTANCE=v201803-py2-amazonlinux-1-2018-3-py2
-    # - env: INSTANCE=v201803-py2-arch-base-latest-2018-3-py2
+    - env: INSTANCE=v201902-py2-centos-6-2019-2-py2
+    # - env: INSTANCE=v201902-py2-amazonlinux-1-2019-2-py2
 
     ## Define the release stage that runs `semantic-release`
     - stage: 'release'

kitchen.yml

 # Make sure the platforms listed below match up with
 # the `env.matrix` instances defined in `.travis.yml`
 platforms:
-  ## SALT `3000.1`
-  - name: debian-10-3000-1-py3
+  ## SALT `3000.2`
+  - name: debian-10-3000-2-py3
     driver:
-      image: netmanagers/salt-3000.1-py3:debian-10
-  - name: ubuntu-1804-3000-1-py3
+      image: netmanagers/salt-3000.2-py3:debian-10
+  - name: debian-9-3000-2-py3
     driver:
-      image: netmanagers/salt-3000.1-py3:ubuntu-18.04
-  - name: centos-8-3000-1-py3
+      image: netmanagers/salt-3000.2-py3:debian-9
+  - name: ubuntu-1804-3000-2-py3
     driver:
-      image: netmanagers/salt-3000.1-py3:centos-8
-  - name: fedora-31-3000-1-py3
+      image: netmanagers/salt-3000.2-py3:ubuntu-18.04
+  - name: centos-8-3000-2-py3
     driver:
-      image: netmanagers/salt-3000.1-py3:fedora-31
-  - name: opensuse-leap-151-3000-1-py3
+      image: netmanagers/salt-3000.2-py3:centos-8
+  - name: centos-7-3000-2-py3
     driver:
-      image: netmanagers/salt-3000.1-py3:opensuse-leap-15.1
+      image: netmanagers/salt-3000.2-py3:centos-7
+  - name: fedora-31-3000-2-py3
+    driver:
+      image: netmanagers/salt-3000.2-py3:fedora-31
+  - name: opensuse-leap-151-3000-2-py3
+    driver:
+      image: netmanagers/salt-3000.2-py3:opensuse-leap-15.1
       run_command: /usr/lib/systemd/systemd
     # Workaround to avoid intermittent failures on `opensuse-leap-15.1`:
     # => SCP did not finish successfully (255):  (Net::SCP::Error)
     transport:
       max_ssh_sessions: 1
-  - name: amazonlinux-2-3000-1-py3
+  - name: amazonlinux-2-3000-2-py3
     driver:
-      image: netmanagers/salt-3000.1-py3:amazonlinux-2
-  - name: arch-base-latest-3000-1-py2
+      image: netmanagers/salt-3000.2-py3:amazonlinux-2
+  - name: ubuntu-1804-3000-2-py2
     driver:
-      image: netmanagers/salt-3000.1-py2:arch-base-latest
-      run_command: /usr/lib/systemd/systemd
+      image: netmanagers/salt-3000.2-py2:ubuntu-18.04
+  - name: ubuntu-1604-3000-2-py2
+    driver:
+      image: netmanagers/salt-3000.2-py2:ubuntu-16.04
 
   ## SALT `2019.2`
   - name: debian-10-2019-2-py3
   - name: ubuntu-1804-2019-2-py3
     driver:
       image: netmanagers/salt-2019.2-py3:ubuntu-18.04
+  - name: ubuntu-1604-2019-2-py3
+    driver:
+      image: netmanagers/salt-2019.2-py3:ubuntu-16.04
   - name: centos-8-2019-2-py3
     driver:
       image: netmanagers/salt-2019.2-py3:centos-8
+  - name: centos-7-2019-2-py3
+    driver:
+      image: netmanagers/salt-2019.2-py3:centos-7
   - name: fedora-31-2019-2-py3
     driver:
       image: netmanagers/salt-2019.2-py3:fedora-31
   - name: amazonlinux-2-2019-2-py3
     driver:
       image: netmanagers/salt-2019.2-py3:amazonlinux-2
-  - name: ubuntu-1804-2019-2-py2
-    driver:
-      image: netmanagers/salt-2019.2-py2:ubuntu-18.04
-  - name: centos-7-2019-2-py2
+  - name: centos-6-2019-2-py2
     driver:
-      image: netmanagers/salt-2019.2-py2:centos-7
-  - name: arch-base-latest-2019-2-py2
-    driver:
-      image: netmanagers/salt-2019.2-py2:arch-base-latest
-      run_command: /usr/lib/systemd/systemd
-
-  ## SALT `2018.3`
-  - name: debian-9-2018-3-py2
-    driver:
-      image: netmanagers/salt-2018.3-py2:debian-9
-  - name: ubuntu-1604-2018-3-py2
-    driver:
-      image: netmanagers/salt-2018.3-py2:ubuntu-16.04
-  - name: centos-7-2018-3-py2
-    driver:
-      image: netmanagers/salt-2018.3-py2:centos-7
-  - name: amazonlinux-1-2018-3-py2
-    driver:
-      image: netmanagers/salt-2018.3-py2:amazonlinux-1
+      image: netmanagers/salt-2019.2-py2:centos-6
       run_command: /sbin/init
-  - name: arch-base-latest-2018-3-py2
+  - name: amazonlinux-1-2019-2-py2
     driver:
-      image: netmanagers/salt-2018.3-py2:arch-base-latest
-      run_command: /usr/lib/systemd/systemd
+      image: netmanagers/salt-2019.2-py2:amazonlinux-1
+      run_command: /sbin/init
 
 provisioner:
   name: salt_solo
 suites:
   - name: v3000-py3
     includes:
-      - debian-10-3000-1-py3
-      - ubuntu-1804-3000-1-py3
-      - centos-8-3000-1-py3
-      - fedora-31-3000-1-py3
-      - opensuse-leap-151-3000-1-py3
-      - amazonlinux-2-3000-1-py3
+      - debian-10-3000-2-py3
+      - debian-9-3000-2-py3
+      - ubuntu-1804-3000-2-py3
+      - centos-8-3000-2-py3
+      - centos-7-3000-2-py3
+      - fedora-31-3000-2-py3
+      - opensuse-leap-151-3000-2-py3
+      - amazonlinux-2-3000-2-py3
     provisioner:
       state_top:
         base:
         - path: test/integration/v3000-py3
   - name: v3000-py2
     includes:
-      - arch-base-latest-3000-1-py2
+      - ubuntu-1804-3000-2-py2
+      - ubuntu-1604-3000-2-py2
     provisioner:
       state_top:
         base:
       - debian-10-2019-2-py3
       - debian-9-2019-2-py3
       - ubuntu-1804-2019-2-py3
+      - ubuntu-1604-2019-2-py3
       - centos-8-2019-2-py3
+      - centos-7-2019-2-py3
+      - fedora-31-2019-2-py3
       - opensuse-leap-151-2019-2-py3
       - amazonlinux-2-2019-2-py3
     provisioner:
         - path: test/integration/v201902-py3
   - name: v201902-py2
     includes:
-      - ubuntu-1804-2019-2-py2
-      - centos-7-2019-2-py2
-      - arch-base-latest-2019-2-py2
+      - centos-6-2019-2-py2
+      - amazonlinux-1-2019-2-py2
     provisioner:
       state_top:
         base:
     verifier:
       inspec_tests:
         - path: test/integration/v201902-py2
-  - name: v201803-py2
-    includes:
-      - debian-9-2018-3-py2
-      - ubuntu-1604-2018-3-py2
-      - centos-7-2018-3-py2
-      - amazonlinux-1-2018-3-py2
-      - arch-base-latest-2018-3-py2
-    provisioner:
-      state_top:
-        base:
-          '*':
-            - salt.pkgrepo
-            - salt.master
-            - salt.minion
-      pillars:
-        top.sls:
-          base:
-            '*':
-              - salt
-              - v201803-py2
-      pillars_from_files:
-        salt.sls: test/salt/pillar/salt.sls
-        v201803-py2.sls: test/salt/pillar/v201803-py2.sls
-    verifier:
-      inspec_tests:
-        - path: test/integration/v201803-py2