https://repo.opensciencegrid.org/osg/3.6-upcoming/el7/testing/x86_64
http://mirror.hep.wisc.edu/upstream/osg/3.6-upcoming/el7/testing/x86_64
https://t2.unl.edu/osg/3.6-upcoming/el7/testing/x86_64
https://mirror.grid.uchicago.edu/pub/osg/3.6-upcoming/el7/testing/x86_64
https://linux-mirrors.fnal.gov/linux//osg/3.6-upcoming/el7/testing/x86_64