ci(kitchen+travis): modify matrix to include `develop` platform

* Use balanced matrix based on `template-formula` guidelines
* Initial ref: https://github.com/saltstack-formulas/template-formula/issues/118

.travis.yml

@@ -15,21 +15,27 @@ services:
 # the `platforms` defined in `kitchen.yml`
 env:
   matrix:
-    - INSTANCE: default-debian-9-2019-2-py3
+    - INSTANCE: default-debian-9-develop-py3
+    # - INSTANCE: default-ubuntu-1804-develop-py3
+    # - INSTANCE: default-centos-7-develop-py3
+    # - INSTANCE: default-fedora-29-develop-py3
+    # - INSTANCE: default-opensuse-leap-15-develop-py3
+    # - INSTANCE: default-debian-9-2019-2-py3
     - INSTANCE: default-ubuntu-1804-2019-2-py3
     - INSTANCE: default-centos-7-2019-2-py3
-    - INSTANCE: default-fedora-29-2019-2-py3
-    - INSTANCE: default-opensuse-leap-15-2019-2-py3
+    # - INSTANCE: default-fedora-29-2019-2-py3
+    # - INSTANCE: default-opensuse-leap-15-2019-2-py3
     # - INSTANCE: default-debian-9-2018-3-py2
     # - INSTANCE: default-ubuntu-1604-2018-3-py2
     # - INSTANCE: default-centos-7-2018-3-py2
-    # - INSTANCE: default-fedora-29-2018-3-py2
+    - INSTANCE: default-fedora-29-2018-3-py2
     # TODO: Use this when fixed instead of `opensuse-leap-42`
     # Ref: https://github.com/netmanagers/salt-image-builder/issues/2
     # - INSTANCE: default-opensuse-leap-15-2018-3-py2
-    # - INSTANCE: default-opensuse-leap-42-2018-3-py2
-    # - INSTANCE: default-debian-8-2017-7-py2
+    - INSTANCE: default-opensuse-leap-42-2018-3-py2
+    - INSTANCE: default-debian-8-2017-7-py2
     # - INSTANCE: default-ubuntu-1604-2017-7-py2
+    # TODO: Enable after improving the formula to work with other than `systemd`
     # - INSTANCE: default-centos-6-2017-7-py2
     # - INSTANCE: default-fedora-28-2017-7-py2
     # - INSTANCE: default-opensuse-leap-42-2017-7-py2

kitchen.yml

@@ -11,14 +11,43 @@ driver:
 # Make sure the platforms listed below match up with
 # the `env.matrix` instances defined in `.travis.yml`
 platforms:
+  ## SALT `develop`
+  - name: debian-9-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:debian-9
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: ubuntu-1804-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:ubuntu-18.04
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: centos-7-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:centos-7
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: fedora-29-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:fedora-29
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: opensuse-leap-15-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:opensuse-leap-15
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+      run_command: /usr/lib/systemd/systemd
+
   ## SALT 2019.2
   - name: debian-9-2019-2-py3
     driver:
       image: netmanagers/salt-2019.2-py3:debian-9
-      provision_command:
-        - apt-get update && apt-get install -y locales
-        - echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
-        - locale-gen en_US.UTF-8
   - name: ubuntu-1804-2019-2-py3
     driver:
       image: netmanagers/salt-2019.2-py3:ubuntu-18.04
@@ -37,10 +66,6 @@ platforms:
   - name: debian-9-2018-3-py2
     driver:
       image: netmanagers/salt-2018.3-py2:debian-9
-      provision_command:
-        - apt-get update && apt-get install -y locales
-        - echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
-        - locale-gen en_US.UTF-8
   - name: ubuntu-1604-2018-3-py2
     driver:
       image: netmanagers/salt-2018.3-py2:ubuntu-16.04
@@ -65,10 +90,6 @@ platforms:
   - name: debian-8-2017-7-py2
     driver:
       image: netmanagers/salt-2017.7-py2:debian-8
-      provision_command:
-        - apt-get update && apt-get install -y locales
-        - echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
-        - locale-gen en_US.UTF-8
   - name: ubuntu-1604-2017-7-py2
     driver:
       image: netmanagers/salt-2017.7-py2:ubuntu-16.04
@@ -76,7 +97,6 @@ platforms:
     driver:
       image: netmanagers/salt-2017.7-py2:centos-6
       run_command: /sbin/init
-      run_options: -v /lib/modules:/lib/modules:ro
   - name: fedora-28-2017-7-py2
     driver:
       image: netmanagers/salt-2017.7-py2:fedora-28