Always use host netns
Always use host netns

which allows us to get rid of port mappings and a whole bunch of other
code.

n054/weave,n054/weave,paulbellamy/weave,n054/weave,dpw/weave,weaveworks/weave,paulbellamy/weave,weaveworks/weave,dpw/weave,weaveworks/weave,paulbellamy/weave,dpw/weave,n054/weave,dpw/weave,weaveworks/weave,n054/weave,dpw/weave,paulbellamy/weave