mysql_info - Add connector_name and connector_version to returned value (#497)

* Add methods to retrieve connector name and version
* Document that mysqlclient is also named MySQLdb
* Document version_added
* Add connector name and version in the returned block
* Cut condition to display any name that is return

In case of MySQLdb is renamed in mysqlclient. In that case, the
integration tests will catch this the day we update the connector
version.

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

plugins/modules/mysql_info.py

@@ -58,6 +58,7 @@ seealso:
 author:
 - Andrew Klychkov (@Andersson007)
 - Sebastian Gumprich (@rndmh3ro)
+- Laurent Indermühle (@laurent-indermuehle)
 
 extends_documentation_fragment:
 - community.mysql.mysql
@@ -206,6 +207,21 @@ slave_hosts:
   type: dict
   sample:
   - { "2": { "Host": "", "Master_id": 1, "Port": 3306 } }
+connector_name:
+  description: Name of the python connector used by the module. When the connector is not identified, returns C(Unknown).
+  returned: always
+  type: str
+  sample:
+  - "pymysql"
+  - "MySQLdb"
+  version_added: '3.6.0'
+connector_version:
+  description: Version of the python connector used by the module. When the connector is not identified, returns C(Unknown).
+  returned: always
+  type: str
+  sample:
+  - "1.0.2"
+  version_added: '3.6.0'
 '''
 
 from decimal import Decimal
@@ -216,6 +232,8 @@ from ansible_collections.community.mysql.plugins.module_utils.mysql import (
     mysql_common_argument_spec,
     mysql_driver,
     mysql_driver_fail_msg,
+    get_connector_name,
+    get_connector_version,
 )
 from ansible.module_utils.six import iteritems
 from ansible.module_utils._text import to_native
@@ -558,21 +576,29 @@ def main():
     if mysql_driver is None:
         module.fail_json(msg=mysql_driver_fail_msg)
 
+    connector_name = get_connector_name(mysql_driver)
+    connector_version = get_connector_version(mysql_driver)
+
     try:
         cursor, db_conn = mysql_connect(module, login_user, login_password,
                                         config_file, ssl_cert, ssl_key, ssl_ca, db,
                                         check_hostname=check_hostname,
                                         connect_timeout=connect_timeout, cursor_class='DictCursor')
     except Exception as e:
-        module.fail_json(msg="unable to connect to database, check login_user and login_password are correct or %s has the credentials. "
-                             "Exception message: %s" % (config_file, to_native(e)))
+        msg = ('unable to connect to database using %s %s, check login_user '
+               'and login_password are correct or %s has the credentials. '
+               'Exception message: %s' % (connector_name, connector_version, config_file, to_native(e)))
+        module.fail_json(msg)
 
     ###############################
     # Create object and do main job
 
     mysql = MySQL_Info(module, cursor)
 
-    module.exit_json(changed=False, **mysql.get_info(filter_, exclude_fields, return_empty_dbs))
+    module.exit_json(changed=False,
+                     connector_name=connector_name,
+                     connector_version=connector_version,
+                     **mysql.get_info(filter_, exclude_fields, return_empty_dbs))
 
 
 if __name__ == '__main__':