Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Jenny Chou and Zach Robinson:
     SSO update now does a delete and recreate of the SSO client. [#62008174] ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20956671 )
     Add dashboard sso client updating to broker_api_v2.2_spec.rb ( Travis Unknown )
     Move in_test_mode? presentation concerns to ErrorPresenter. ( Travis Unknown )
  Alex Stupakov, David Sabeti, Jenny Chou and Matt Royal:
     Support updating uaa clients per [#62008174] ( Travis Unknown )
  Alex Stupakov and Jenny Chou:
     Updated CC API docs for delete service endpoint to include purge parameter ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20955655 )
  Karl Isenberg:
     Cloud Controller generates VCAP_APPLICATION for DEAs. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20655063 )
     Refactor app validations to policies to reduce app class complexity. ( Travis Unknown )
  Chris Adams:
     Remove extraneous line in spec ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20571352 )
  Tammer Saleh:
     Add api spec that exercises sort order ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20556179 )
     API spec to exercise common functionality ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20555228 )
     Move rspec api docs templates into api/documentation as well ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20553687 )
     Separate specs that generate api docs from the ones that do not ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/20553197 )