Fetch Kubernetes node list every time round reclaim loop
Fetch Kubernetes node list every time round reclaim loop

If we retain the Kubernetes list for a long time we might see a peer
appear in the Weave list and conclude it has been deleted. We must
always fetch the Kubernetes list after fetching the Weave list, during
deletion.

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