qa_crowbarsetup: allow to specify root password
qa_crowbarsetup: allow to specify root password

this makes it more suitable for production-level clouds

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