Fix header flags in dns.spicy and add RFC 2535 bits

rsmmr / hilti

**NOTE**: This is outdated and no longer maintained. There's a new version at https://github.com/zeek/spicy.

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Closed dloss closed 7 years ago

dloss commented 7 years ago

RFC 1035 section 4.1.1 specifies that the opcode has 4 bits. There is no extra padding bit.
Add the AD and CD bits introduced by RFC 2535 (section 6.1.1). They use two of the three original Z bits.