compares two rrs. The TTL is not looked at.
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rr1: the first one
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rr2: the second one
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Returns 0 if equal
-1 if rr1 comes before rr2
+1 if rr2 comes before rr1
ldns_rr_compare_ds()
returns true of the given rr's are equal.
Also returns true if one record is a DS that represents the
same DNSKEY record as the other record
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rr1: the first rr
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rr2: the second rr
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Returns true if equal otherwise false
AUTHOR
The ldns team at NLnet Labs. Which consists out of
Jelte Jansen and Miek Gieben.