tests: Add send test to tcp_server
tests: Add send test to tcp_server

$ printf "txtx" | nc 192.168.66.123 10000

Server will send a large mount of data to client for TCP tx testing.
Currently, it sends 10MB of char 'X'.

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