Clean up Cinder service checks

Use $CINDER_SERVICE_NAMES in all is_service_enabled calls where
one or more services are checked; i.e. replace 'cinder' as the argument
to eliminate the hack in the is_service_enabled() function.

TODO: remove the cinder test from is_service_enabled() after a transition period

Change-Id: I6079ba253517d5418f8d193a22d390851696b342
Clean up Ceilometer service checks

Use $CEILOMETER_SERVICE_NAMES in all is_service_enabled calls where
one or more services are checked; i.e. replace 'ceilometer' as the argument
to eliminate the hack in the is_service_enabled() function.

TODO: remove the ceilometer test from is_service_enabled() after a transition period

Change-Id: Ib3d4eb39f71dc6c2aa6ae58e11ce687ca70d452b
Begin is_service_enabled() cleanup

This lays the groundwork to convert the special cases in the
is_service_enabled() function to call individual functions declared by
the projects.  This allows projects that are not in the DevStack repo
and called via the extras.d plugin to handle an equivalen service alias.

Change-Id: I4879ec51287088f471df867b96e0531bd58908e6
Merge branch 'info-update' into dt-test
Merge branch 'enabled-base' into dt-test
Merge branch 'enabled-cinder' into dt-test
Merge branch 'enabled-glance' into dt-test
Merge branch 'enabled-ceilometer' into dt-test
Merge branch 'plugin-functions' into dt-test
Merge branch 'samples-update' into dt-test
Merge branch 'cleaner' into dt-test