Revert "Reenable redis for keystone in eqiad"

This reverts commit f3fce1d7588fca83d0a9c4d166ba6610a695682a.

While it works for Wikitech, it breaks glance.  Disabling for now.

Change-Id: I3316f653d7b7b4fdf314145db609e76b564dcbd1