When loading a DSA key from an raw (without DH parameters) ASN.1 serialization,

perform some consistency checks on its `p' and `q' values, and return an
error if the checks failed.

Thanks for Georgi Guninski (guninski at guninski dot com) for mentioning
the possibility of a weak (non prime) q value and providing a test case.

See https://cpunks.org/pipermail/cypherpunks/2015-September/009007.html
for a longer discussion.

ok bcook@ beck@

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