Add NEUTRON_ENDPOINT_SERVICE_NAME variable to set service name

This option can be used to set name of the service used in the
networking service endpoint URL.

Depends-On: https://review.opendev.org/c/openstack/grenade/+/850306

Change-Id: I9e9a06eadc1604214c627bd3bda010cc00aaf83d
2 files changed