Fix URL for horizon in Debian

This patch fixes the URL for the Horizon dashboard in
Debian. It uses https, and not /horizon (but the root
of the server).

Change-Id: If12095b61ace9c5881e4421bdca042d9b5b8449b
backport: havana
(cherry picked from commit e014f10eb5b90ff522180151a223890810b1cbe8)
Removed the libvirt service command printed twice in step 7

Added seperate line for opensuse
Closes-Bug: #1250727

Change-Id: I765d139799de2039accb7baa959713b922249bb1
backport: havanna
(cherry picked from commit cba7d6eeef0505071614cf39cf3c262ac908c0b0)
Merge "Removed the libvirt service command printed twice in step 7" into stable/havana
Merge "Fix URL for horizon in Debian" into stable/havana