group-create-from-src doesn't work in active/active mode

[Ivan Kolodyazhny]

Steps to reproduce:

1. Deploy cinder with Ceph in A/A mode
2. Run tempest.api.volume.admin.test_group_snapshots.GroupSnapshotsTest.test_create_group_from_group_snapshot failed test

The bug is reproducible via CLI too using `cinder group-create-from-src` command if you try to create a volume group from volume group snapshot.

Expected results:
Volume group is created

Actual resultes:
Scheduler fails to find a valid host and API returns an erros:
Invalid Group: No valid host to create group 8b1c5e42-161b-4fd7-8254-7992782a9f1a.'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/713649

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/713649
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=8d67562831606d048f6f381a5b94814216664fbe
Submitter: Zuul
Branch: master

commit 8d67562831606d048f6f381a5b94814216664fbe
Author: Ivan Kolodyazhny <email address hidden>
Date: Wed Mar 18 15:10:39 2020 +0200

    Set cluster name for volume groups

    In Active/Active HA mode we need to store not only worker hostname but
    cluster name too. This patch saves cluster name for groups created from other
    groups or snaphshots.

    Change-Id: I6f160cc44350f0d378fdddb7943e8cdcc15be1b8
    Closes-Bug: #1867906