Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Eric Malm:
     Change symbols to strings for Fog directory get ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/29738658 )
  Joseph Palermo:
     Fix bug introduced when cleaning up buildpacks ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/29736021 )
     Revert "Revert "Clean up Buildpack and Buildpack Controller"" ( Travis Unknown )
     Clean up spec database usage ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/29735174 )
     Remove sqlite support ( Travis Unknown )

Signed-off-by: Michael Fraenkel <fraenkel@us.ibm.com>