mysql_role: new module (#189) (#200)

* mysql_role: new module

* fixes

* fixes

* Add the role class

* Check if role exists

* role.add()

* role.__get_members

* tmp

* tmp

* Change tests

* Fix

* Fix

* add_members()

* get_privs()

* tmp

* __extract_grants() filler version

* Before big work

* tmp

* drop()

* tmp

* tmp

* Big changes

* Fix

* append_members, detach_members, append_privs

* tmp

* admin option

* Add tests

* Add tests

* Fix tests

* Remove debug warning

* Fix tests

* Add documentation

* Fix MariaDB case

* Fix MariaDB

* Fix MariaDB

* Fix MariaDB

* Fix MariaDB

* Fix MariaDB

* Fix

* Fix

* Remove debug warning

* Add try-except block

* tmp

* tmp

* tmp

* Fix

* Add err handling

* Add user check

* Check admin in db

* Fix CI

* Fix CI

* Fix CI

* Fix CI

* Fix

* Add mutually exclusive options

* Small refactoring, documenting

* Documenting, refactoring

* Change docs

* Refactoring

* Refactoring

* Refactoring

* Add unit tests

* Update README.md

(cherry picked from commit ce2b269f84)

tests/integration/targets/test_mysql_role/tasks/main.yml

@@ -0,0 +1,7 @@
+####################################################################
+# WARNING: These are designed specifically for Ansible tests       #
+# and should not be used as examples of how to write Ansible roles #
+####################################################################
+
+# mysql_role module initial CI tests
+- import_tasks: mysql_role_initial.yml