Revert "Move ironic-standalone to non-voting"
Revert "Move ironic-standalone to non-voting"

This reverts commit e1e89f8831fd1b28b7ee373fc9504ce4eaf2c4c5.

The commit was a temporary change to allow us to unblock
the ironic CI gate as we had cross-repository fixes that
needed to land before we would be able to have a passing
and stable ironic-standalone job.

Change-Id: Ib1ed0a35955ab7c53b814048887e725234699d9a

openstack/ironic,openstack/ironic