Added steps to upgrade and reboot system after adding OpenStack repos

After adding the OpenStack repos, several distributions need to
upgrade additional packages and sometimes this includes the kernel.
Rebooting also guarantees that all changes will take effect.  I
attempted to cover all distributions with this patch.

Change-Id: I97fbf8f9ce3ff8a403ccbd90f1b0c38d915d9369
Closes-Bug: #1258279
(cherry picked from commit a31e3b9400f40d8c225f109c7c0c718b872c129b)
Merge "Added steps to upgrade and reboot system after adding OpenStack repos" into stable/havana