Added a comment about shutdown tests
Added a comment about shutdown tests

michaelharo/dns,Psiphon-Inc/dns,skynet/dns,hugozhu/dns,ezoic/dns,asergeyev/dns,skyportsystems/dns,miekg/dns,jdef/dns,bragr/dns,tsenart/dns,flebarbe/dns,Git-Host/dns,ErikDubbelboer/dns,AlexCheong/dns,rolandshoemaker/dns,modulexcite/dns,tempbottle/dns,ym/go-dns,cloudflare/dns,letsencrypt/dns,jmhodges/dns,janstk/dns,curtiszimmerman/dns,josephyzhou/dns,bboreham/dns,benbearchen/dns