Cleanup services decorator
Cleanup services decorator

Rather than repeating the list of services twice, use the
one defined in get_service_list. Note that this removes
baremetal from the list of accepted services.

Change-Id: Ib5a9b33a54ef1064f5dc8f6206ddd1c7d218fc8e

cisco-openstack/tempest,Juniper/tempest,openstack/tempest,vedujoshi/tempest,openstack/tempest,Juniper/tempest,masayukig/tempest,cisco-openstack/tempest,masayukig/tempest,vedujoshi/tempest