Ruwiki gets Cirrus as primary

Change-Id: I0cb98838cda03447aa56de285fde4d715970051f
Don't double up shards for some wikis

Change-Id: Ib7a59196acec79bce6daf619def58acfe64613cc
DEPLOYMENT: This only make permanent a setting already applied on the fly.
Merge "Don't double up shards for some wikis"
Merge "Ruwiki gets Cirrus as primary"