Revert "Revert "Reenable redis for keystone in eqiad""

This reverts commit 6a91a745330c0cfd0d2c007864a32a31276a2256.

Change-Id: Ifbe1f69748a78530048a2adf2a812d4db262b29b
Merge "Revert "Revert "Reenable redis for keystone in eqiad""" into production