Add client peer-initiated renego to the state machine tests.

We should be testing asynchronous renego.

BUG=429450

Change-Id: Ib7a5d42f2ac728f9ea0d80158eef63ad77cd77a4
Reviewed-on: https://boringssl-review.googlesource.com/4781
Reviewed-by: Adam Langley <agl@google.com>