Updated openstack/openstack
Project: openstack-dev/devstack  0e160ec1fc0db3ebe30ae7d18c27738aab58c862
null
as is_heat_enabled

this is missing, and the code assumes "heat" to be in the
enabled services list otherwise.

Change-Id: Ib0a7db04d8e38b58aca48261308e7c4d1fd43972