Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Nicholas Calugar:
     Slim down spec_helper.rb ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/26431300 )
  Onsi Fakhouri:
     can now stop apps running on diego ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/26411968 )
     when increasing/decreasing instances for a diego app, take the diego route ( Travis Unknown )
  Ted Young:
     removed unused react_to_package_state_change method from AppObserver ( Travis Unknown )
     staging on diego is triggered if an app has no detected start command ( Travis Unknown )
     renamed update_staging_complete to update_start_command ( Travis Unknown )
     cleaning up diego client ( Travis Unknown )

Signed-off-by: Abhijit Hiremagalur <abhi@pivotallabs.com>