twemproxy isn't mediawiki

Config always looks for datacenter suffix
[ -f "/usr/local/apache/common/wmf-config/twemproxy-$(cat /etc/wikimedia-site)".yaml ] || { stop; exit 0; }

Move version back to twemproxy-eqiad.yaml

Change-Id: I6f1f3f8af5b97aa0e537fbae308ce27b28071894