Fixes name generation for Heat stack

In https://review.openstack.org/105117 despite what commit message says only queue name was changed.
This change makes Heat stack name be set to that name with 'murano-' prefix and description
in HOT template telling what environment owns the stack

Change-Id: I4a398a265031d0428497c6f91dfed88c7003ad21
Merge "Fixes name generation for Heat stack"