/instance/register osName, hostName (#2042)

osName and hostName values are reversed。

oap-server/server-receiver-plugin/skywalking-register-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/register/provider/handler/v5/rest/InstanceDiscoveryServletHandler.java

@@ -70,8 +70,8 @@ public class InstanceDiscoveryServletHandler extends JettyJsonHandler {
             JsonObject osInfoJson = instance.get(OS_INFO).getAsJsonObject();
 
             ServiceInstanceInventory.AgentOsInfo agentOsInfo = new ServiceInstanceInventory.AgentOsInfo();
-            agentOsInfo.setHostname(osInfoJson.get("osName").getAsString());
-            agentOsInfo.setOsName(osInfoJson.get("hostName").getAsString());
+            agentOsInfo.setHostname(osInfoJson.get("hostName").getAsString());
+            agentOsInfo.setOsName(osInfoJson.get("osName").getAsString());
             agentOsInfo.setProcessNo(osInfoJson.get("processId").getAsInt());
 
             JsonArray ipv4s = osInfoJson.get("ipv4s").getAsJsonArray();