Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Abhijit Hiremagalur:
     Centralize db connection logic ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/26714473 )
  Onsi Fakhouri:
     move find_stats call into instances_reporter ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/26714335 )
     move find_crashes into instances_reporter ( Travis Unknown )
     move healthy instances check in to instances_reporter ( Travis Unknown )
     fix spec - tell it how to new a DiegoClient ( Travis Unknown )
     start pulling out instance reporting into an injected instances_reporter ( Travis Unknown )
     add tps report fetcher to diego_client ( Travis Unknown )

Signed-off-by: Zach Robinson <zrobinson@pivotallabs.com>