Don't clear WEAVE-NPC chain here; it is controlled by weave-npc.
Don't clear WEAVE-NPC chain here; it is controlled by weave-npc.

We don't get a very useful error object back from go-iptables and I
didn't feel like parsing the message, so just ignore all errors.
It would be racy to try to check if WEAVE-NPC existed before calling
NewChain.

weaveworks/weave,weaveworks/weave,weaveworks/weave,weaveworks/weave