Print peer temporary key details

Print peer temporary key details

The peer temporary key in TLS session is related to the PFS
exchange/generation. From the SSL_get_peer_tmp_key manual page:

   For example, if ECDHE is in use, then this represents the
   peer's public ECDHE key.

Change-Id: Iaf12bb51a2aac7bcf19070f0b56fa3b1a5863bc3
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20231009105518.34432-1-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg27192.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 4e80aac451b99d5cc0b0cf268ca678e602959191)