qa_devstack.sh: Remove setup of extra repos
qa_devstack.sh: Remove setup of extra repos

https://review.openstack.org/#/c/203619/ tries to achieve
that upstream.

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