Ensure the Heat Domain parameters before starting heat-engine pcmk service

Ensure the Heat Domain parameters before starting heat-engine pcmk service

Heat needs stack_user_domain_id or stack_user_domain_name config
options set in the heat.conf before starting. The domain itself
doesn't need to exist until a stack is actually created, but the
value needs to be there. This patch ensures that the heat domain
parameters are configured before starting the heat-engine service
with Pacemaker at step3 and 4, and at step5, Pacemaker will start
the services and Puppet will create the domains.
(note: commit message copied from
https://review.openstack.org/#/c/331652/ to mitaka tht, which came
first)

Change-Id: I58fa53357265c1607d2df1b04cc2296083212ab7
Closes-Bug: 1599232