Fixed the name of group options in get_opts_lists
Fixed the name of group options in get_opts_lists

* get_opts_lists in tempest plugin takes group name and config
  options but in vitrage tempest plugin under get_opts_lists
  method in config.py, service_name group params was passed
  which leds to OptGroup error while doing tempest init.

Closes-bug: #1685749

Change-Id: Ib8fdbb68ec0f53c4a03b9be8e392385636a75d49

openstack/vitrage,openstack/vitrage,openstack/vitrage