Enable horizon on Fedoras

The previous apache/horizon a688bc65104e7d8998ffdb321d67a9f33df6997e
change left horizon disabled on Fedora.

Closes-Bug: #1326126

Change-Id: I79f84bb63471f84c6b37538e8dfe2bcca3ce3eac
Merge "Enable horizon on Fedoras"
Merge branch 'master' of github.com:openstack-dev/devstack