core: sstring: move initialized_later to be a public member
core: sstring: move initialized_later to be a public member

It's required for instantiating a sstring with the constructor
basic_sstring(initialized_later, size_t size).

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@cloudius-systems.com>

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