Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Mike Dalessio:
     Using FieldEncryptor for ServiceInstance#credentials ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/34411663 )
     Using FieldEncryptor for ServiceBroker#auth_password ( Travis Unknown )
     Using FieldEncryptor for ServiceBinding#credentials ( Travis Unknown )
     Using FieldEncryptor for ServiceAuthToken#token ( Travis Unknown )
     Using FieldEncryptor for EnvironmentVariableGroup#environment_json ( Travis Unknown )
     Using FieldEncryptor for App#environment_json ( Travis Unknown )
     Created VCAP::CloudController::Encryptor::FieldEncryptor and specs ( Travis Unknown )
     Expanding coverage of "encrypted attribute" shared spec ( Travis Unknown )
     EnvironmentVariableGroup blueprint now makes objects with unique names. ( Travis Unknown )