smp: improve forwarding of arguments in distributed::invoke_on()
smp: improve forwarding of arguments in distributed::invoke_on()

It is now capable of moving r-values rather than copying them.

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