Prevent ActiveIpset from recreating ipset after on_unreferenced().
Prevent ActiveIpset from recreating ipset after on_unreferenced().

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