smp: add distributed<>, infrastructure for distributed service
smp: add distributed<>, infrastructure for distributed service

Summary:

  distributed<my_service> dist;

  dist.start() - constructs my_service on all cpus
  dist.stop() - destroys previously constructed instances
  dist.invoke(cpu, &my_service::method, args...) - run method on one cpu
  dist.invoke_on_all(cpu, &my_service::method, args...) - run method on all cpus

flashbuckets/seastar,tempbottle/scylla,shyamalschandra/seastar,kangkot/scylla,cloudius-systems/seastar,shyamalschandra/seastar,acbellini/scylla,bzero/seastar,printedheart/seastar,chunshengster/seastar,dreamsxin/seastar,kangkot/scylla,norcimo5/seastar,dreamsxin/seastar,sjperkins/seastar,raphaelsc/scylla,ducthangho/imdb,leejir/seastar,linearregression/scylla,eklitzke/scylla,asias/scylla,justintung/scylla,anzihenry/seastar,scylladb/seastar,scylladb/seastar,avikivity/scylla,bowlofstew/scylla,acbellini/seastar,anzihenry/seastar,mixja/seastar,scylladb/scylla,rentongzhang/scylla,koolhazz/seastar,capturePointer/scylla,jonathanleang/seastar,jonathanleang/seastar,victorbriz/scylla,rluta/scylla,shaunstanislaus/scylla,linearregression/seastar,justintung/scylla,xtao/seastar,wildinto/seastar,hongliangzhao/seastar,tempbottle/seastar,guiquanz/scylla,bowlofstew/scylla,avikivity/scylla,xtao/seastar,printedheart/seastar,linearregression/seastar,scylladb/scylla,cloudius-systems/seastar,norcimo5/seastar,joerg84/seastar,acbellini/scylla,bowlofstew/scylla,rluta/scylla,acbellini/seastar,syuu1228/seastar,acbellini/scylla,capturePointer/scylla,aruanruan/scylla,stamhe/seastar,slivne/seastar,mixja/seastar,glommer/scylla,leejir/seastar,rentongzhang/scylla,asias/scylla,hongliangzhao/seastar,shaunstanislaus/scylla,kangkot/scylla,raphaelsc/seastar,scylladb/scylla-seastar,tempbottle/seastar,gwicke/scylla,senseb/scylla,scylladb/scylla,dreamsxin/seastar,shaunstanislaus/scylla,printedheart/seastar,respu/scylla,chunshengster/seastar,stamhe/scylla,phonkee/scylla,asias/scylla,kjniemi/scylla,rluta/scylla,gwicke/scylla,joerg84/seastar,scylladb/scylla-seastar,eklitzke/scylla,justintung/scylla,wildinto/scylla,syuu1228/seastar,raphaelsc/seastar,capturePointer/scylla,anzihenry/seastar,norcimo5/seastar,stamhe/scylla,tempbottle/scylla,tempbottle/seastar,syuu1228/seastar,eklitzke/scylla,dwdm/seastar,kjniemi/scylla,ducthangho/imdb,duarten/scylla,gwicke/scylla,dwdm/scylla,guiquanz/scylla,ducthangho/imdb,linearregression/scylla,respu/scylla,cloudius-systems/seastar,scylladb/scylla,slivne/seastar,koolhazz/seastar,scylladb/seastar,dwdm/scylla,guiquanz/scylla,mixja/seastar,linearregression/seastar,kjniemi/seastar,kjniemi/scylla,scylladb/scylla-seastar,victorbriz/scylla,leejir/seastar,avikivity/seastar,dwdm/seastar,jonathanleang/seastar,slivne/seastar,kjniemi/seastar,sjperkins/seastar,bzero/seastar,raphaelsc/seastar,koolhazz/seastar,phonkee/scylla,shyamalschandra/seastar,bowlofstew/seastar,joerg84/seastar,hongliangzhao/seastar,chunshengster/seastar,linearregression/scylla,stamhe/scylla,glommer/scylla,phonkee/scylla,flashbuckets/seastar,rentongzhang/scylla,dwdm/scylla,victorbriz/scylla,tempbottle/scylla,acbellini/seastar,senseb/scylla,senseb/scylla,flashbuckets/seastar,raphaelsc/scylla,bowlofstew/seastar,avikivity/seastar,stamhe/seastar,duarten/scylla,raphaelsc/scylla,glommer/scylla,avikivity/scylla,wildinto/scylla,avikivity/seastar,duarten/scylla,wildinto/seastar,xtao/seastar,bzero/seastar,dwdm/seastar,respu/scylla,bowlofstew/seastar,kjniemi/seastar,sjperkins/seastar,stamhe/seastar,wildinto/scylla,wildinto/seastar,aruanruan/scylla,aruanruan/scylla