sstring: add literal + sstring concatentation overload
sstring: add literal + sstring concatentation overload

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