horizon does not uses django-registration

It was removed from the requirements since long, by
a47aa6fdc33ee29be886b45236e276a42a70b4df.

Just the files/rpms/horizon referencing it.

Change-Id: Ic1d413855e80a6f64d9d255f2d3a41f0925332c5
Merge "horizon does not uses django-registration"
Workaround Saucy trying to connect to DBUS

Devstack fails on saucy, because keystone-client calls end up trying to
connect to DBus. This connection fails due to the lack of DISPLAY
variable.

Workaround for bug #1242992

Change-Id: If6daae861128cab311c86beeaaa8fb1418760bf4
Merge "Default RABBIT_HOST to be the SERVICE_HOST."
Merge commit 'refs/changes/83/86083/1' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch