Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Jeff Schnitzer and Ryan Tang:
     service_provider and service_label are optional ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11079175 )
  Ian Lesperance and Jimmy Da:
     Get service bindability from v2 broker catalog ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11075981 )
  Alex Choi and Jeff Schnitzer:
     Removed no-op tests. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11037267 )
     Pruned code that was accidentally added in a conflict merge ( Travis Unknown )
bump router instance size to m1.medium
upgrade to binary Go 1.1.2 x64 distribution

[finishes #56398284]