nova-compute-service doesn't expose a port

AFAIK the service files are only for services with ports exposed.  Since
nova-compute doesn't expose a port, kubecfg returns an error when attempting
to register it:

F1014 17:06:34.329482 32317 kubecfg.go:395] Got request error:
service "novacompute" is invalid: port: invalid value '0'

Change-Id: I4d9f8d50d538f42d520f3d9437ab32aa6a226d2b
Merge "nova-compute-service doesn't expose a port"