Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Tammer Saleh:
     Add spec to prove the debug behavior [#63932310] ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/19696120 )
     Use named subject in spec [#63932310] ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/19694836 )
     Make the app stager task spec more flexible [#63932310] ( Travis Unknown )
  Eric Malm:
     Merge branch 'stopthenatsloggingspam' of git://github.com/mheath/cloud_controller_ng into mheath-stopthenatsloggingspam ( Travis Unknown )
  Mike Heath:
     Fixed spec to ignore both info and debug level logging. ( Travis Unknown )
     Lower the logging level for NATS messages to debug. ( Travis Unknown )

Signed-off-by: Tammer Saleh <tammer@pivotallabs.com>