Remove workaround, found a different solution in the image
qa_crowbarsetup.sh Don't test Nova V3 API anymore

Its broken and gone.
Adjust path to tempest cleanup script
Simply use the sources defined by the new cloudsource

cloudsource is a variable like "develcloud3", so it should
just s/3/4/ in that case. s/Cloud-3/Cloud-4/ would not do anything.

Instead of duplicating code (in an incorrect way), simply set the
new cloudsource and let h_set_source_variables do its magic.