do proper mock periodic gossip
do proper mock periodic gossip

instead of abusing broadcast gossip

Fixes #1203.

achanda/weave,dpw/weave,rade/weave,achanda/weave,weaveworks/weave,squaremo/weave,bboreham/weave,awanke/weave,bboreham/weave,dpw/weave,paulbellamy/weave,awh/weave,aaam/weave,tomwilkie/weave,n054/weave,bboreham/weave,rade/weave,awh/weave,n054/weave,BWITS/weave,squaremo/weave,squaremo/weave,narry/weave,philipz/weave,achanda/weave,philipz/weave,paladin74/weave,awh/weave,kidaa/weave,achanda/weave,beni55/weave,beni55/weave,cgvarela/weave,bboreham/weave,squaremo/weave,n054/weave,rade/weave,tomwilkie/weave,cgvarela/weave,BWITS/weave,achanda/weave,tomwilkie/weave,awanke/weave,awh/weave,cgvarela/weave,weaveworks/weave,rade/weave,awanke/weave,narry/weave,BWITS/weave,paulbellamy/weave,n054/weave,tomwilkie/weave,weaveworks/weave,n054/weave,BWITS/weave,awh/weave,paladin74/weave,aaam/weave,BWITS/weave,beni55/weave,dpw/weave,narry/weave,paladin74/weave,kidaa/weave,paulbellamy/weave,philipz/weave,cgvarela/weave,kidaa/weave,paladin74/weave,tomwilkie/weave,bboreham/weave,aaam/weave,beni55/weave,squaremo/weave,philipz/weave,beni55/weave,awanke/weave,awanke/weave,dpw/weave,paulbellamy/weave,cgvarela/weave,philipz/weave,narry/weave,weaveworks/weave,dpw/weave,aaam/weave,aaam/weave,kidaa/weave,narry/weave,kidaa/weave,paladin74/weave,rade/weave