Added configration for /etc/heat/heat.conf
Added configration for /etc/heat/heat.conf

It fixes missing parameter in heat install documentation (api-paste.ini).

backport: havana

Change-Id: I498a57224097f2630551577f2915466d41b4e827
Closes-Bug: #1243242

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