Moved gnocchi tempest tests under telemetry tempest plugin

* In order to achieve tempest plugin split goal, we have merged
  aodh, panko, ceilometer and gnocchi tempest plugin into
  telemetry tempest plugin

* gnocchi/tempest -> telemetry_tempest_plugin/gnocchi
* gnocchi/tests/functional_live -> telemetry_tempest_plugin/gnocchi

Change-Id: Icf6789afc143db3206af409c62a36e56edefd142
diff --git a/telemetry_tempest_plugin/plugin.py b/telemetry_tempest_plugin/plugin.py
index 0d8fdfd..2f2861e 100644
--- a/telemetry_tempest_plugin/plugin.py
+++ b/telemetry_tempest_plugin/plugin.py
@@ -43,6 +43,9 @@
         config.register_opt_group(
             conf, tempest_config.alarming_group,
             tempest_config.AlarmingGroup)
+        config.register_opt_group(
+            conf, tempest_config.metric_group,
+            tempest_config.metric_opts)
 
     def get_opt_lists(self):
         return [(tempest_config.telemetry_group.name,
@@ -52,4 +55,6 @@
                 (config.service_available_group.name,
                  tempest_config.service_option),
                 (tempest_config.alarming_group.name,
-                 tempest_config.AlarmingGroup)]
+                 tempest_config.AlarmingGroup),
+                (tempest_config.metric_group.name,
+                 tempest_config.metric_opts)]