Updated openstack/openstack
Project: openstack/heat  56041687844c7c04bfcad974a07ac3ff35f99e5c

Default engine workers to the number of CPUs

The engine is single-threaded and thus needs more workers to handle more
concurrent requests on a single machine.

Change-Id: I36117c3876f84a2ff7ba5576444fdbf7716cc69e