Remove machine-id after virt-customize
Remove machine-id after virt-customize

RHOSINFRA-1652: Remove static /etc/machine-id from
overcloud image after virt-customize usage on rhel-7.5

Change-Id: I6c5014722a152c27173bfd254d84c6eb95c56d2f

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared