Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Maria Shaldibina and Onsi Fakhouri:
     [migration] Move organization managers to organization members ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/14230661 )
     Don't delete user from organization if he has a role in it ( Travis Unknown )
     User must be a member of organization before getting any role ( Travis Unknown )
  Tim Labeeuw:
     Small Refactors ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/14227554 )
     correct JSON encoding for App Buildpack attributes ( Travis Unknown )
     Small refactors ( Travis Unknown )
  Matthew Sykes:
     Update development/test gems ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/14213955 )
  Charlie Bevis:
     Merge branch 'allow_orgs_see_new_appdomains' of https://github.com/brahmaroutu/cloud_controller_ng into brahmaroutu-allow_orgs_see_new_appdomains ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/14209196 )
  srini brahmaroutu:
     New app domains from the deployment manifest are now added to the existing organizations during deployment ( Travis Unknown )