Add client-side tests for renegotiation_info enforcement.

Since we hope to eventually lose server-side renegotiation support
altogether, get the client-side version of those tests. We should have
had those anyway to test that the default is to allow it.

BUG=429450

Change-Id: I4a18f339b55f3f07d77e22e823141e10a12bc9ff
Reviewed-on: https://boringssl-review.googlesource.com/4780
Reviewed-by: Adam Langley <agl@google.com>