Run 'telemetry-dsvm-integration-ipv6-only' job in gate
Run 'telemetry-dsvm-integration-ipv6-only' job in gate

As part of Train community goal 'Support IPv6-Only Deployments and Testing'[1],
Tempest has defined the base job 'devstack-tempest-ipv6' which will
deploy services on IPv6.

This commit Run 'telemetry-dsvm-integration-ipv6-only' job in ceilometer gate.

Story: #2005477
Task: #35939

[1] https://governance.openstack.org/tc/goals/train/ipv6-support-and-testing.html

Change-Id: I068c996b04c75f0aa077b1902e7be2ab7afc3983

openstack/ceilometer,openstack/ceilometer