Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Abhijit Hiremagalur:
     Log warn and error instead of info ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/32261649 )
     Make most of handler private ( Travis Unknown )
     Implement desire request for Docker protocol ( Travis Unknown )
     Stage before Desire makes more sense ( Travis Unknown )

Signed-off-by: Peter Parente <pparent@us.ibm.com>