Support to remove datastore config parameters

CLI:
trove-manage db_remove_datastore_config_parameters mysql 5.7.29

Change-Id: Ia8b5828dfabd595d0ac33a2fdf1d9959f2d1d9ba

releasenotes/notes/victoria-trove-manager-remove-config-params.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - Trove admin user is able to remove the default configuration parameters for
+    datastore version, e.g.
+    ``trove-manage db_remove_datastore_config_parameters mysql 5.7.29``

trove/cmd/manage.py

@@ -87,6 +87,13 @@ class Commands(object):
         config_models.load_datastore_configuration_parameters(
             datastore, datastore_version, config_file_location)
 
+    def db_remove_datastore_config_parameters(self, datastore,
+                                              datastore_version):
+        print("Removing config parameters for datastore (%s) version (%s)"
+              % (datastore, datastore_version))
+        config_models.remove_datastore_configuration_parameters(
+            datastore, datastore_version)
+
     def datastore_version_flavor_add(self, datastore_name,
                                      datastore_version_name, flavor_ids):
         """Adds flavors for a given datastore version id."""
@@ -230,6 +237,17 @@ def main():
             help='Fully qualified file path to the configuration group '
             'parameter validation rules.')
 
+        parser = subparser.add_parser(
+            'db_remove_datastore_config_parameters',
+            description='Remove configuration group parameter validation '
+                        'rules for a datastore version from the database.')
+        parser.add_argument(
+            'datastore',
+            help='Name of the datastore.')
+        parser.add_argument(
+            'datastore_version',
+            help='Name of the datastore version.')
+
         parser = subparser.add_parser(
             'datastore_version_flavor_add', help='Adds flavor association to '
             'a given datastore and datastore version.')

trove/configuration/models.py

@@ -378,10 +378,19 @@ def load_datastore_configuration_parameters(datastore,
             )
 
 
+def remove_datastore_configuration_parameters(datastore, datastore_version):
+    get_db_api().configure_db(CONF)
+    (ds, ds_version) = dstore_models.get_datastore_version(
+        type=datastore, version=datastore_version, return_inactive=True)
+    db_params = DatastoreConfigurationParameters.load_parameters(ds_version.id)
+    for db_param in db_params:
+        db_param.delete()
+
+
 def persisted_models():
     return {
         'configurations': DBConfiguration,
         'configuration_parameters': DBConfigurationParameter,
         'datastore_configuration_parameters':
-        DBDatastoreConfigurationParameters,
+            DBDatastoreConfigurationParameters,
     }