added Ubuntu_18.yml for SQL configuraiton

roles/mysql/vars/Ubuntu_18.yml

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