Add service-delete subcommand to delete a service

In nova https://review.openstack.org/#/c/39998/ expose an API to delete
a service. Both in V1.1 and V3.

This patch make novaclient support it.

Change-Id: I4aaabc866b464c046b46eda68734f37223c6d6a0
Implements: blueprint support-delete-service
Merge "Add service-delete subcommand to delete a service"