Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  James Myers and Michael Fraenkel:
     Add unique validation for names on AppSecurityGroups ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/28263257 )
  Michael Fraenkel:
     Update api checksum ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/28259536 )
Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Eric Malm and James Myers:
     Pass in DiegoClient to DeaClient.configure ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/28271388 )
  Joseph Palermo:
     Replace shared examples with tests for required attributes ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/28268001 )