mysql_db: use new exception handling, fixes build (#4373)

lib/ansible/modules/database/mysql/mysql_db.py

@@ -366,7 +366,8 @@ def main():
                             module.fail_json(msg="%s" % stderr)
                         else:
                             module.exit_json(changed=True, db=db, msg=stdout)
-                except Exception, e:
+                except Exception:
+                    e = get_exception()
                     module.fail_json(msg="error creating database: " + str(e))
 
         elif state == "absent":