Add SkipChangeCipherSpec tests.

They pass, but this is an error case that is probably worth a test.

Change-Id: I37b2eec34a1781fa8342eea57ee4f9da81ce17ed
Reviewed-on: https://boringssl-review.googlesource.com/1257
Reviewed-by: Adam Langley <agl@google.com>
4 files changed