Remove peer_cert from SESS_CERT.

It's completely redundant with the copy in the SSL_SESSION except it
isn't serialized.

Change-Id: I1d95a14cae064c599e4bab576df1dd156da4b81c
Reviewed-on: https://boringssl-review.googlesource.com/5757
Reviewed-by: Adam Langley <agl@google.com>
4 files changed