Use osapi_compute worker for api v2 service

osapi_compute is intended to be a superset of the compute APIs (v1
through v3 and beyond). So use the worker settings for osapi_compute
when launching any service that starts with 'openstack_compute_api' that
might be defined in paste.ini and in enabled_apis. While this could
result in the single setting causing nX workers, where n is each
openstack_compute_api_* thing defined, it is expected that only one is
enabled, or the full superset is enabled.

Change-Id: Ic1bb69c8675f2ffb71cdf8a4b38ba7b02e697458
Merge "Use osapi_compute worker for api v2 service"