don't set pcap timeout, to prevent cpu churn pcap timeouts are a mystery. Setting the timeout to -1 used to reduce latency, but that was before we started setting immediate mode. And it turns out that with that timeout, pcap chews through a lot of CPU polling its file descriptor, checking timers, etc.
don't set pcap timeout, to prevent cpu churn
pcap timeouts are a mystery. Setting the timeout to -1 used to reduce
latency, but that was before we started setting immediate mode. And it
turns out that with that timeout, pcap chews through a lot of CPU
polling its file descriptor, checking timers, etc.

With no timeout set an idle weave is completely idle - no system calls
at all.

Fixes #80

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