merge r3456, r3458, r3465: SSL fixes: *) decrease SSL handshake error level to info *) Set SSL session context for "ssl_session_cache none". This fixes a bug when client certficate is used and nginx closes connection with the message: "SSL_GET_PREV_SESSION:session id context uninitialized". *) add OpenSSL_add_all_algorithms(), this fixes the error "ASN1_item_verify:unknown message digest algorithm" occurred if client certificate is signed using sha256WithRSAEncryption