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Fix infinite loops in DSA sign code.
Fixes #20268 Values such as q=1 or priv=0 caused infinite loops when calling DSA_sign() without these changes. There are other cases where bad domain parameters may have caused infinite loops where the retry counter has been added. The simpler case of priv=0 also hits this case. q=1 caused an infinite loop in the setup. The max retry value has been set to an arbitrary value of 8 (it is unlikely to ever do a single retry for valid values). The minimum q bits was set to an arbitrary value of 128 (160 is still used for legacy reasons when using 512 bit keys). Thanks @guidovranken for detecting this, and @davidben for his insightful analysis. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from #20384) (cherry picked from commit 3a4e09a)
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