tests: Make udp_server SMP aware
tests: Make udp_server SMP aware

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