Support #17364: Reviving CVMFS
Add 64 bit directories
From Robert Hatcher:
So everywhere you have "minossoft/X" you should also have "minossoft_srt_64bit/X"
(i.e. X for srt, setup, packages, releases )
Also, "minossoft_srt_64bit/minos_ups_products" plays (a similar, but now smaller) roll as does the "products" area at the top level of /grid/fermiapp/minos (but now has fewer >products because we rely on external areas such as common, nova & larsoft).