Fix that nat table's IptablesUpdater.cleanup() wasn't called.
Fix that nat table's IptablesUpdater.cleanup() wasn't called.

matthewdupre/felix,TrimBiggs/calico,Metaswitch/calico,Metaswitch/calico,beddari/calico,ocadotechnology/calico,neiljerram/felix,matthewdupre/felix,anortef/calico,alexhersh/calico,ocadotechnology/calico,neiljerram/felix,beddari/calico,anortef/calico,kasisnu/calico,kasisnu/calico,neiljerram/felix,neiljerram/felix,alexhersh/calico,TrimBiggs/calico