Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Eric Malm:
     Bump vcap_common to 4.0.1 ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/19994848 )
     Update vcap_common to 3.0.1 and membrane to 1.0 ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/19835218 )
  Tammer Saleh:
     Stop publishing config in varz ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/19838883 )