The pubmirror[12].math.uh.edu mirrors of Fedora 31 updates for
x86_64 have been sitting stale for several days with a corrupt
index, causing jobs which access our copy of this from our mirror
network to fail. Instead mirror Fedora releases/updates from
mirrors.mit.edu which seems to be updating just fine currently. We
can switch this back if/when the situation with the uh.edu mirrors
is resolved.
We're continuing to mirror EPEL and Fedora Atomic from
pubmirror[12].math.uh.edu for now, as we've had no reports of EPEL
problems on our mirrors (yet anyway), and it's hard to find any
other rsync mirrors of Atomic.
Change-Id: Iefd02602e2f2b39c4b72dc4d95ac62993ca65cdd