Added all files

examples/012_mysql_management/playbook/clean-database.yml

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+---
+- hosts: database
+  become: true
+  tasks:
+    - name: create demo database
+      mysql_db: name=demo state=absent
+
+    - name: create demo user
+      mysql_user: name=demo password=demo priv=demo.*:ALL host='%' state=absent