Ignore missing Q in dh_params

Some implementations don't send the required Q value in dh_params, so
allow it to be absent.

(cherry picked from commit ed77a25c53ed6afd41372838f205a98a561a89fb)

ticket: 7658 (new)
version_fixed: 1.10.6
status: resolved
Allow config of dh_min_bits < 2048

Allow configuration to override the default dh_min_bits of 2048 to
1024.  Disallow configuration of dh_min_bits < 1024, but continue to
default to 2048.

(cherry picked from commit cae44d2d014985022a001924dce4a56d12c63818)

ticket: 7659 (new)
version_fixed: 1.10.6
status: resolved