non-regression: add option --ignore-malformed
non-regression: add option --ignore-malformed

Sometimes it is handy to be able to easily ignore malformed packets in
a capture during a non-regression test.

didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc