Bandersnatch mirroring has been disabled since
I88a838cb28fee3bd16b2b0a26e614ac5c2f23241 which is currently almost 6
months ago. Since then we have been running a reverse caching proxy.
Although bandersnatch served us well, it seems pypi has become
impractical to mirror locally. This is partially due to 2TB volume
limitations of OpenAFS and partially due to us not having a sane way
to filter large, frequently updating packages. With the reverse proxy
working there are no plans to restore our local mirror.
Retire the references to it before we clean up the AFS volumes.
Change-Id: Ia23828328dd859bbf26f95735c1c2e99c573d10e
85297878f5