define openstack-havana repo as bare link

rdo rpm for some reasons comes with puppetlabs and other useless repos
Merge pull request #164 from MirantisDellCrowbar/sbubnov/bug/rhel-havana/repofix/hydrogen/master

https://github.com/crowbar/barclamp-glance/pull/164

Merged by devtool for ArkadyKanevsky