httpd: Support close initiated on server side
httpd: Support close initiated on server side

This makes ab work:

$ ab -n 1000 http://ip:10000/

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