add mysql role

roles/mysql/vars/Debian.yaml

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+---
+mysql_cfg_path: /etc/my.cnf

roles/mysql/vars/Ubuntu-18.yaml

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+---
+mysql_service_name: 'mysql.service'
+mysql_cfg_path: /etc/mysql/my.cnf
+
+# vim:ft=yaml.ansible:

roles/mysql/vars/Ubuntu.yaml

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+---
+mysql_package_name: 'mysql-server'
+
+# vim:ft=yaml.ansible:

roles/mysql/vars/main.yml

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+---
+# vars file for roles/mysql