qa_crowbarsetup.sh: Only enable Cinder v2 api on Cloud 4.x
qa_crowbarsetup.sh: Only enable Cinder v2 api on Cloud 4.x

Its already default and enabled on Cloud 5.x, and can't
be disabled.

vmoravec/automation,gosipyan/automation,gosipyan/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,aspiers/automation,SUSE-Cloud/automation,vmoravec/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,aspiers/automation,gosipyan/automation,vmoravec/automation,vmoravec/automation