Only allow vswitch cpu core changes if the host has the following label
openstack-compute-node=enabled
Change-Id: I23944ad1b7b61dbe7f287d55fb8ebc9a8901aa86
Story: 2004022
Task: 28948
Depends-On: https://review.openstack.org/#/c/631540
Signed-off-by: David Sullivan <david.sullivan@windriver.com>