Specify memcache servers for nova::controller

Specify all memcache servers instead of 127.0.0.1.
Otherwise, noVNC service will be broken

Change-Id: Id1bb3fb36aab812d8c52a16bddc27231619a684b
Closes-Bug: 1350706
Closes-Bug: 1323705
Merge "Specify memcache servers for nova::controller"