remove WEAVE iptable chain on 'weave stop' No point keeping it around.
remove WEAVE iptable chain on 'weave stop'
No point keeping it around.

Also, simplify idempotence of masquerading setup.

Follow-up to issue #48.

Lawouach/weave,weaveworks/weave,tomwilkie/weave,inercia/weave,rade/weave,n054/weave,errordeveloper/weave,paladin74/weave,Lawouach/weave,kidaa/weave,Lawouach/weave,aaam/weave,ycaihua/weave,bboreham/weave,aaam/weave,19hz/weave,awh/weave,inercia/weave,paladin74/weave,errordeveloper/weave,paladin74/weave,weaveworks/weave,tomwilkie/weave,paladin74/weave,OnePaaS/weave,2opremio/weave,19hz/weave,beni55/weave,2opremio/weave,beni55/weave,dpw/weave,cgvarela/weave,BWITS/weave,squaremo/weave,BWITS/weave,achanda/weave,narry/weave,aaam/weave,2opremio/weave,bboreham/weave,OnePaaS/weave,rade/weave,squaremo/weave,achanda/weave,squaremo/weave,paulbellamy/weave,OnePaaS/weave,n054/weave,OnePaaS/weave,paladin74/weave,weaveworks/weave,inercia/weave,bboreham/weave,awanke/weave,kidaa/weave,ycaihua/weave,weaveworks/weave,aaam/weave,narry/weave,n054/weave,awanke/weave,BWITS/weave,dpw/weave,cgvarela/weave,achanda/weave,beni55/weave,kidaa/weave,philipz/weave,awh/weave,19hz/weave,dpw/weave,narry/weave,kidaa/weave,2opremio/weave,tomwilkie/weave,tomwilkie/weave,philipz/weave,kidaa/weave,dpw/weave,beni55/weave,achanda/weave,narry/weave,awh/weave,2opremio/weave,n054/weave,ycaihua/weave,errordeveloper/weave,achanda/weave,paulbellamy/weave,awh/weave,awanke/weave,cgvarela/weave,awh/weave,BWITS/weave,rade/weave,OnePaaS/weave,inercia/weave,philipz/weave,awanke/weave,rade/weave,errordeveloper/weave,bboreham/weave,philipz/weave,cgvarela/weave,ycaihua/weave,paulbellamy/weave,rade/weave,dpw/weave,aaam/weave,n054/weave,errordeveloper/weave,awanke/weave,tomwilkie/weave,inercia/weave,squaremo/weave,paulbellamy/weave,Lawouach/weave,philipz/weave,beni55/weave,cgvarela/weave,19hz/weave,squaremo/weave,narry/weave,ycaihua/weave,bboreham/weave,BWITS/weave