qa_crowbarsetup.sh: Don't modify DNS proposal before node allocation
qa_crowbarsetup.sh: Stop creating DNS proposals

The DNS propsal always exists, we just need to update it instead
of trying to create a new one.
qa_crowbarsetup: Always setup SLE12 repositories for Cloud 5+

This allows e.g. the QA team to manually go in and install more than
one SLE12 node.
Merge pull request #161 from dirkmueller/master

fixes for multi dns tests
qa_crowbarsetup.sh: The naming layout for M3 changed
qa_crowbarsetup.sh: Treat Mx as Cloud 5.x for now
Adds SUSE cloud storage repositories to crowbar admin node