qa_crowbarsetup.sh: avoid locking on zypper
qa_crowbarsetup.sh: avoid locking on zypper

This is by no means a good fix, but it hopefully makes the
race disappear..

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