change log REST endpoint with v3 prefixed (#7062)

docs/en/protocols/Log-Data-Protocol.md

@@ -45,7 +45,7 @@ Json log record example:
 
 ## HTTP API
 
-Report `json` format logs via HTTP API, the endpoint is http://<oap-address>:12800/logs.
+Report `json` format logs via HTTP API, the endpoint is http://<oap-address>:12800/v3/logs.
 
 Json log record example:
 

oap-server/server-receiver-plugin/skywalking-log-recevier-plugin/src/main/java/org/apache/skywalking/oap/server/recevier/log/provider/handler/rest/LogReportServiceRestHandler.java

@@ -90,6 +90,6 @@ public class LogReportServiceRestHandler extends JettyHandler {
 
     @Override
     public String pathSpec() {
-        return "/logs";
+        return "/v3/logs";
     }
 }