Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Ruth:
     Merge pull request #169 from sykesm/trial-be-gone-migration ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/21693747 )
  Matthew Sykes:
     Sequal migration for trial_db removal ( Travis Unknown )

Signed-off-by: Ruth Byers <rbyers@pivotallabs.com>