Add group resources for quota syncing

Currently `cinder-manage quota sync` crashes if there are rows of
resource groups in table quota_usages. This patch adds 'groups',
'_sync_groups' and 'quota_groups' to the resource types it checks for.

Closes-Bug: https://bugs.launchpad.net/cinder/+bug/2107451
Change-Id: I237b232a8482427f95edd08a0e1daebd349d8afb

cinder/cmd/manage.py

@@ -490,6 +490,7 @@ class QuotaCommands(object):
         ctxt = context.get_admin_context()
         # Get the quota usage types and their sync methods
         resources = quota.QUOTAS.resources
+        resources.update(quota.GROUP_QUOTAS.resources)
 
         # Get all project ids that have quota usage. Method doesn't lock
         # projects, since newly added projects should not be out of sync and

releasenotes/notes/fix-cinder-manage-groups-quota-bug-421ae9c9eb99b22f.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    `Bug #2107451 <https://bugs.launchpad.net/cinder/+bug/2107451>`_: Fixed
+    crash of `cinder-manage quota sync` if there is a row in the
+    quota_usage table with the value groups for column resource