rejigged mysql install procedure

Former-commit-id: 2a896a3f

roles/mysql/tasks/Ubuntu_18_mysql_server.yml

@@ -4,7 +4,7 @@
     update_cache: yes
   become: true
 
-- name: "Installing MySQL Debian"
+- name: "Installing MySQL for Ubuntu"
   apt: name="{{ server_packages }}" update_cache=yes state=present
   become: true
 

roles/mysql/vars/Ubuntu_18.yml

 server_packages:
   - python
   - python-dev
-  - libmariadbclient-dev
+  - libmysqlclient-dev
   - python-pip
   - libapache2-mod-wsgi
   - python-mysql.connector
-  - mariadb-server
+  - mysql-server
   - python-mysqldb
 
 client_packages:
   - python
   - mariadb-client
 
-sqlServiceName: "mariadb"
+sqlServiceName: "mysqld"