Zabbix

...G...PS. [ZBX-11101] fixed extraction of certificate attributes for OpenSSL:
  - removed zbx_get_issuer_subject();
  - added zbx_x509_dn_gets() implementation for OpenSSL as a replacement for zbx_get_issuer_subject();
  - added zbx_log_peer_cert() implementation for OpenSSL based on zbx_x509_dn_gets();
  - made corresponding changes to OpenSSL part of zbx_tls_connect(), zbx_tls_accept() and zbx_tls_get_attr_cert().