Adds Support for bind_host of Heat Services

Previously, the Heat services would bind to the default IP address
(0.0.0.0) for HA deployments.  This patch allows the Heat services
to be consistent with all other controller services by specifying
a bind_host address.

Change-Id: I367c2a9acb02f892ac0e64d44ddc9820f71b2ef2
Merge "Adds Support for bind_host of Heat Services"