Updated openstack/openstack
Project: openstack-dev/devstack  5d920e02e30f375253ff9a5f6fef010c95c2fb4b
null
add heat to the default devstack service list

heat has been integrated for a while, we should turn it on out of
the box. Also refactor the service list to make it simpler to
understand what's enabled.

Change-Id: I9738f39ce196d5c7f75b0a5b164222ea165fb340