Add test case for reset group status

Reset group status is a new api implemented in v3 generic volume groups,
min_microversion is 3.20. This patch adds test case for this new feature.

Including:

[1] Add reset group status api to v3 groups_client
[2] Add unit test for reset group status api
[3] Add test case: test_reset_group_status
[4] Add release note

Change-Id: I41d0c3f459c139a0e5e415c030cddbb1fe8beb46
diff --git a/tempest/api/volume/admin/test_groups.py b/tempest/api/volume/admin/test_groups.py
index baea37b..2056df2 100644
--- a/tempest/api/volume/admin/test_groups.py
+++ b/tempest/api/volume/admin/test_groups.py
@@ -23,10 +23,7 @@
 CONF = config.CONF
 
 
-class GroupsTest(base.BaseVolumeAdminTest):
-    _api_version = 3
-    min_microversion = '3.14'
-    max_microversion = 'latest'
+class BaseGroupsTest(base.BaseVolumeAdminTest):
 
     def _delete_group(self, grp_id, delete_volumes=True):
         self.groups_client.delete_group(grp_id, delete_volumes)
@@ -65,6 +62,12 @@
         self.assertEqual(grp_name, grp['name'])
         return grp
 
+
+class GroupsTest(BaseGroupsTest):
+    min_microversion = '3.14'
+    max_microversion = 'latest'
+    _api_version = 3
+
     @decorators.idempotent_id('4b111d28-b73d-4908-9bd2-03dc2992e4d4')
     def test_group_create_show_list_delete(self):
         # Create volume type
@@ -320,3 +323,30 @@
             if vol['group_id'] == grp['id']:
                 grp_vols.append(vol)
         self.assertEqual(2, len(grp_vols))
+
+
+class GroupsV320Test(BaseGroupsTest):
+    _api_version = 3
+    min_microversion = '3.20'
+    max_microversion = 'latest'
+
+    @decorators.idempotent_id('b20c696b-0cbc-49a5-8b3a-b1fb9338f45c')
+    def test_reset_group_status(self):
+        # Create volume type
+        volume_type = self.create_volume_type()
+
+        # Create group type
+        group_type = self.create_group_type()
+
+        # Create group
+        group = self._create_group(group_type, volume_type)
+
+        # Reset group status
+        self.addCleanup(waiters.wait_for_volume_resource_status,
+                        self.groups_client, group['id'], 'available')
+        self.addCleanup(self.admin_groups_client.reset_group_status,
+                        group['id'], 'available')
+        for status in ['creating', 'available', 'error']:
+            self.admin_groups_client.reset_group_status(group['id'], status)
+            waiters.wait_for_volume_resource_status(
+                self.groups_client, group['id'], status)