resolved: store DNSKEY fields flags+protocol as-is

resolved: store DNSKEY fields flags+protocol as-is

When verifying signatures we need to be able to verify the original
data we got for an RR set, and that means we cannot simply drop flags
bits or consider RRs invalid too eagerly. Hence, instead of parsing the
DNSKEY flags store them as-is. Similar, accept the protocol field as it
is, and don't consider it a parsing error if it is not 3.

Of course, this means that the DNSKEY handling code later on needs to
check explicit for protocol != 3.