Changes memcached to listen on internal address

Limits memcached binding to internal address only and changes OpenStack
components to only connect to that port. Tested with non HA and HA deployments.

Change-Id: I0e8bca92a7d79a83bed489146a5821c719f8f1bf
Closes-Bug: 1355079
Merge "Changes memcached to listen on internal address"