Added additional records types to be formatted in func (rr *DNSResourceRecord) String().
Added additional records types to be formatted in func (rr *DNSResourceRecord) String().

levigross/gopacket,skyportsystems/gopacket,xuzhaokui/gopacket,levigross/gopacket,xuzhaokui/gopacket,rouzier/gopacket,skyportsystems/gopacket,rouzier/gopacket,levigross/gopacket,skyportsystems/gopacket,google/gopacket,google/gopacket,xuzhaokui/gopacket,rouzier/gopacket,google/gopacket