define openstack-havana repo as bare link

rdo rpm for some reasons comes with puppetlabs and other useless repos
rpc_backend is set explicitely
smoke is opeartional for now
lets start service on rhel at all conditions for now
addressing hack by issue
case for nova user guid
Merge pull request #280 from MirantisDellCrowbar/sbubnov/bug/rhel-neutron/hydrogen/master

https://github.com/crowbar/barclamp-nova/pull/280

Merged by devtool for ArkadyKanevsky