Test that warning alerts are ignored.

Partly inspired by the new state exposed in
dc3da938992d209a3b36acbd9695cfcab1fdf041, stress this codepath by spamming our
poor shim with warning alerts.

Change-Id: I876c6e52911b6eb57493cf3e1782b37ea96d01f8
Reviewed-on: https://boringssl-review.googlesource.com/4112
Reviewed-by: Adam Langley <agl@google.com>
3 files changed