Add http_upgrade and proxy_connection to log format

Author: zacblazic

config/log.conf

@@ -8,10 +8,12 @@ log_format main_json escape=json
     '"body_bytes_sent":"$body_bytes_sent",'
     '"host":"$host",'
     '"http_connection":"$http_connection",'
+    '"http_upgrade":"$http_upgrade",'
     '"http_referer":"$http_referer",'
     '"http_user_agent":"$http_user_agent",'
     '"http_x_amzn_trace_id":"$http_x_amzn_trace_id",'
     '"http_x_forwarded_for":"$http_x_forwarded_for",'
+    '"proxy_connection":"$proxy_connection",'
     '"proxy_x_forwarded_port":"$proxy_x_forwarded_port",'
     '"proxy_x_forwarded_proto":"$proxy_x_forwarded_proto",'
     '"proxy_x_forwarded_ssl":"$proxy_x_forwarded_ssl",'