Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Abhijit Hiremagalur:
     Merge remote-tracking branch 'origin/pr/190' ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/21973223 )
  fraenkel:
     Correct how positions were managed. ( Travis Unknown )

Signed-off-by: Matthew Sykes <matthew.sykes@gmail.com>