1. 客户端报SSL_R_SSLV3_ALERT_CERTIFICATE_UNKNOWN错误时，不作为maybe pinning; 2. ssl policy中增加protocol_errors的bypass开关。

platform/include/internal/ssl_service_cache.h

@@ -13,6 +13,7 @@ struct ssl_service_status
 	char is_ev;
 	char is_ct;
 	char is_mutual_auth;
+	char has_protocol_errors;
 };
 
 struct ssl_service_cache;
@@ -25,6 +26,7 @@ struct ssl_service_cache_statistics
 {
 	long long pinning_cli_cnt;
 	long long mutual_auth_cli_cnt;
+	long long proto_err_cli_cnt;
 	long long ev_srv_cnt;
 	long long ct_srv_cnt;
 };