Added tests to support mixed case Type and Class
Added tests to support mixed case Type and Class

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