Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Phan Le:
     Trying to fix a flakey test. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/23220270 )
  Alex Stupakov and Zach Robinson:
     Bump X-Broker-Api-Version to 2.3 [#69495998] ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/23169513 )

Signed-off-by: Phan Le <ple@pivotallabs.com>
Remove non-clustered nats config and code

[#63328694]

Signed-off-by: Phan Le <ple@pivotallabs.com>