Support openSUSE in install-dependencies

This should be enough to allow install-dependencies to run successfully
on recent versions of openSUSE, and has been tested on openSUSE 12.3.
It will not work for SLES due to the way the path to the
Cloud:OpenStack:Master repo is constructed, but it should be enough to
go on with for now.

Change-Id: I5b5485e644aa55ee96c835560a6b01869968136a
Merge "Support openSUSE in install-dependencies"