[install-guide] [yum] initialize /etc/heat/heat.conf file
[install-guide] [yum] initialize /etc/heat/heat.conf file

At the moment RDO packages do not ship a /etc/heat/heat.conf file
and it is necessary to manually copy /usr/share/heat/heat-dist.conf
to /etc/heat/heat.conf.

Workaround for https://bugzilla.redhat.com/show_bug.cgi?id=1213476.

Partially implements bp installguide-kilo.

Change-Id: I93376e1f881409063bd7687a3ee0f8fc46bdb882

gongysh2004/openstack-manual,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,potsmaster/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,saeki-masaki/openstack-manuals,Akasurde/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,potsmaster/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,gongysh2004/openstack-manual