Add a test to assert parsing V2ClientHellos works.

Should have test coverage there as long as we care about supporting it.

Change-Id: Ic67539228b550f2ebd0b543d5a58640913b0474b
Reviewed-on: https://boringssl-review.googlesource.com/1371
Reviewed-by: Adam Langley <agl@google.com>
5 files changed