We now offer debian-openstack packages[1] for jessie-newton. Give a
way for users to enable them.
[1] http://mirror.dfw.rax.openstack.org/debian-openstack/
Change-Id: Ie3343608fb4c3af77680fb959c717785bc2567c6
Signed-off-by: Paul Belanger <pabelanger@redhat.com>