Check the nodes have packages updated to SUSE Cloud 4 packages

We do that before the reboot (and the migration of neutron bits).

https://bugzilla.novell.com/show_bug.cgi?id=892500
(cherry picked from commit 8e86e1df687cc0238917548fd603e4bcf101c93f)
Do not output the result of "rpm -q" in our logs

It's useless.
Merge pull request #15 from dirkmueller/suse-cloud-4

Check the nodes have packages updated to SUSE Cloud 4 packages