osnailyfacter changes for heat

* Add keystone_ec2_uri parameter to the openstack:heat section.
This changeset rewrites default values for heat::keystone_ec2_uri,
which points to localhost instead of controller_node_address.
* Remove RedHat OS check for openstack:heat.
Closes-Bug: 1352444

Change-Id: Id170eb1f6061f08154db110ef15d55bfbbfdf67c
Merge "osnailyfacter changes for heat"