Bump src/cloud_controller_ng and make security group lists overridable

Bump cloudfoundry/cloud_controller_ng:
  Eric Malm and Zach Robinson:
     Allow lists of default running and staging security groups ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/29559629 )
  Graeme Davison:
     Remove spec that only applies to sqlite ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/29554276 )
     Clean up controller specs ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/29552126 )
Revert "Enable opt-in network access to inherited DNS servers and Bump src/warden"

This reverts commit b11f40ae5083902c19cc08c2c0e94adc7142dc84.