Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Alex Suraci:
     optimize seeding shared domains ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/14565370 )
  Aram Price:
     Normalize ruby declaration in .travis.yml ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/14560325 )