main: Wire up gossip and friends
main: Wire up gossip and friends

Integrate messaging_service and failure_detector and gossiper into urchin.

To start a 3 nodes cluster on a single host:

./seastar --listen-address 127.0.0.1 --seed-provider-parameters 127.0.0.1
./seastar --listen-address 127.0.0.2 --seed-provider-parameters 127.0.0.1
./seastar --listen-address 127.0.0.3 --seed-provider-parameters 127.0.0.1

scylladb/scylla,stamhe/scylla,aruanruan/scylla,kjniemi/scylla,kjniemi/scylla,bowlofstew/scylla,gwicke/scylla,tempbottle/scylla,dwdm/scylla,asias/scylla,acbellini/scylla,avikivity/scylla,glommer/scylla,kangkot/scylla,dwdm/scylla,duarten/scylla,linearregression/scylla,shaunstanislaus/scylla,shaunstanislaus/scylla,phonkee/scylla,avikivity/scylla,tempbottle/scylla,asias/scylla,aruanruan/scylla,rluta/scylla,stamhe/scylla,phonkee/scylla,eklitzke/scylla,scylladb/scylla,respu/scylla,capturePointer/scylla,capturePointer/scylla,bowlofstew/scylla,victorbriz/scylla,linearregression/scylla,stamhe/scylla,dwdm/scylla,rluta/scylla,asias/scylla,kangkot/scylla,rentongzhang/scylla,aruanruan/scylla,glommer/scylla,respu/scylla,duarten/scylla,eklitzke/scylla,justintung/scylla,rentongzhang/scylla,acbellini/scylla,senseb/scylla,phonkee/scylla,scylladb/scylla,respu/scylla,shaunstanislaus/scylla,glommer/scylla,gwicke/scylla,scylladb/scylla,acbellini/scylla,eklitzke/scylla,rentongzhang/scylla,raphaelsc/scylla,avikivity/scylla,senseb/scylla,kangkot/scylla,kjniemi/scylla,bowlofstew/scylla,guiquanz/scylla,guiquanz/scylla,gwicke/scylla,wildinto/scylla,guiquanz/scylla,justintung/scylla,justintung/scylla,linearregression/scylla,wildinto/scylla,capturePointer/scylla,raphaelsc/scylla,tempbottle/scylla,rluta/scylla,wildinto/scylla,raphaelsc/scylla,duarten/scylla,victorbriz/scylla,senseb/scylla,victorbriz/scylla