Implement CAA resource record #48
Merged
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This patch implements handling of CAA resource records defined by RFC8659.
Based on ruby/ruby#1732 by @aeris, with tests added and some changes:
CAAclass is defined as a class-independent RRType.CAAclass storesflagsfield (a 1-octet bitset) as an Integer. In this way it's easier to ensure the encoded RR is in the valid wire format.