Bump src/cloud_controller_ng, src/dea_next, src/tests

Bump cloudfoundry/cloud_controller_ng:
  Maria Shaldibina and Phan Le:
     Remove unused code ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11843782 )
     Provide the correct buildpack urls for dea ( Travis Unknown )
  Ian Lesperance:
     Fix integration test file name ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11843255 )
Bump cloudfoundry/dea_ng:
  Maria Shaldibina and Phan Le:
     Update vagrant username ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/11842871 )
     Cleanup accidentally pushed WIP ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/11840264 )
     Add Vagrant testing back ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/11839994 )
     Reinstate the travis.run for jenkins ( Travis Failed: https://travis-ci.org/cloudfoundry/dea_ng/builds/11832236 )
     WIP ( Travis Failed: https://travis-ci.org/cloudfoundry/dea_ng/builds/11831867 )
     Remove unused paths_to_bind ( Travis Unknown )
     Delegate config generation to workspace ( Travis Unknown )
     Buildpacks accept list of directories ( Travis Unknown )
     Changed test description to be clearer. ( Travis Unknown )
     Remove platform config ( Travis Unknown )
Bump cloudfoundry/vcap-yeti:
  Maria Shaldibina and Phan Le:
     Add admin buildpack tests ( Travis Unknown )
  Nick Wade:
     Another attempt to make the loggregator tests more stable ( Travis Unknown )