mirror: still rewrite download.lab url for clarity
mirror: still rewrite download.lab url for clarity

Put back explicit rewriting of download.lab*
urls in yum.repos.d files, to be explicitely
visible in jobs which host/mirror was used
in case there will be any yum failures related.

Change-Id: Ie1d5e60094a48cf72e4033fc6119152259f1fe0c

okolisny/InfraRed,okolisny/InfraRed,redhat-openstack/infrared,okolisny/InfraRed,redhat-openstack/infrared,redhat-openstack/infrared