Use my own ns_server branch

Change-Id: I2eac9328c64f7c27b83caad866d0c3104ab36802
Reviewed-on: http://review.couchbase.org/28654
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>