[upgrade] Use FQDN to disable nova-compute service

When listing the services:
root@os-ci-test10:~# nova-manage service list
Binary           Host                                 Zone
Status     State Updated_At
nova-consoleauth os-ci-test10.XX.enovance.com       internal
enabled    :-)   None
nova-scheduler   os-ci-test10.XX.enovance.com       internal
enabled    :-)   None

So we need FQDN, not hostnames.