test(mysql): add tests with mysql

.travis.yml

     # - env: INSTANCE=default-arch-base-latest-3000-3-py2
     # - env: INSTANCE=upstart-centos-6-2019-2-py2
     # - env: INSTANCE=upstart-amazonlinux-1-2019-2-py2
+    - env: INSTANCE=mysql-debian-10-master-py3
+    - env: INSTANCE=mysql-ubuntu-2004-master-py3
 
     ## Define the release stage that runs `semantic-release`
     - stage: 'release'

kitchen.yml

       inspec_tests:
         - path: test/integration/_mapdata
         - path: test/integration/default
+  - name: mysql
+    includes:
+      - debian-10-master-py3
+      - ubuntu-2004-master-py3
+    provisioner:
+      state_top:
+        base:
+          '*':
+            - diaspora
+            - mysql
+      pillars:
+        top.sls:
+          base:
+            '*':
+              - diaspora
+              - tests
+              - mysql
+      pillars_from_files:
+        diaspora.sls: pillar.example
+        tests.sls: test/salt/pillar/tests.sls
+        mysql.sls: test/salt/pillar/mysql.sls
+      dependencies:
+        - name: mysql
+          path: test/salt/states
+    verifier:
+      inspec_tests:
+        - path: test/integration/default

test/salt/pillar/mysql.sls

+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+diaspora:
+  database:
+    type: mysql

test/salt/states/mysql/init.sls

+mysql_package:
+  pkg.installed:
+    - pkgs:
+      - mariadb-server
+      - python3-mysqldb
+
+mysql_service:
+  service.running:
+    - name: mariadb
+    - require:
+      - pkg: mysql_package
+
+mysql_user:
+  mysql_user.present:
+    - name: {{ salt['pillar.get']('diaspora:database:username') }}
+    - password: {{ salt['pillar.get']('diaspora:database:password') }}
+    - require:
+      - service: mysql_service
+  mysql_grants.present:
+    - grant: all privileges
+    - database: {{ salt['pillar.get']('diaspora:database:database') }}.*
+    - user: {{ salt['pillar.get']('diaspora:database:username') }}
+    - require:
+      - mysql_user: mysql_user
+    - require_in:
+      - cmd: diaspora_create_database