fix server execution in integration test
fix server execution in integration test

use exec in running command to allow started process to be killed

mwpastore/sinatra,d-bot/sinatra,eileencodes/sinatra,midorineko/sinatra,ryanshaw/sinatra,gferguson-gd/sinatra,nicoayala/sinatra,ktw1222/sinatra,sethuster/sinatra,porras/sinatra,sethuster/sinatra,siberianbear/sinatra,kyontan/sinatra,Rayheng/sinatra,emiliocorpus/sinatra,howtolearntocode/sinatra,RosenDimov/sinatra,davydovanton/sinatra,frechei/sinatra,cyberid41/sinatra,burningTyger/sinatra,marocchino/sinatra,jenalgit/sinatra,gferguson-gd/sinatra,JonRowe/sinatra,QLGu/sinatra,ksw2599/sinatra,ksw2599/sinatra,ktw1222/sinatra,JonMidhir/sinatra,midorineko/sinatra,kumji/sinatra,jkowens/sinatra,lastcat/sinatra,eileencodes/sinatra,mwpastore/sinatra,ganmacs/sinatra,burningTyger/sinatra,cyberid41/sinatra,d-bot/sinatra,miyazawatomoka/sinatra,frechei/sinatra,DoraALin/sinatra,laplaceliu/sinatra,davydovanton/sinatra,sinatra/sinatra,jkowens/sinatra,twanies/sinatra,sinatra/sinatra,kgrz/sinatra,QLGu/sinatra,twanies/sinatra,kumji/sinatra,nicoayala/sinatra,Rayheng/sinatra,siberianbear/sinatra,jenalgit/sinatra,Wirachmat/sinatra,ganmacs/sinatra,JonMidhir/sinatra,howtolearntocode/sinatra,ryanshaw/sinatra,guidohcosta/sinatra,JonRowe/sinatra,ABaldwinHunter/sinatra-classic,jkowens/sinatra,porras/sinatra,trexnix/sinatra,laplaceliu/sinatra,guidohcosta/sinatra,trexnix/sinatra,wzheng1/sinatra,Wirachmat/sinatra,dariubs/sinatra,dariubs/sinatra,autopp/sinatra,wzheng1/sinatra,kyontan/sinatra,miyazawatomoka/sinatra,DoraALin/sinatra,blambeau/sinatra,bmizerany/sinatra,mwpastore/sinatra,burningTyger/sinatra,emiliocorpus/sinatra,nju520/sinatra,nju520/sinatra,Callygraphy/morrissey,JonMidhir/sinatra,ABaldwinHunter/sinatra-classic,defsprite/sinatra,autopp/sinatra,RosenDimov/sinatra,lastcat/sinatra,defsprite/sinatra