add mock method to force the DefaultServerConnection40Instrumentation to run on driver > 4.0 only

Author: na-ji

dd-java-agent/instrumentation/mongo/driver-4.0/src/main/java/datadog/trace/instrumentation/mongo/DefaultServerConnection40Instrumentation.java

@@ -9,6 +9,7 @@
 import com.google.auto.service.AutoService;
 import com.mongodb.connection.ConnectionDescription;
 import com.mongodb.internal.connection.DefaultServerConnection;
+import com.mongodb.internal.session.SessionContext;
 import datadog.trace.agent.tooling.Instrumenter;
 import datadog.trace.agent.tooling.InstrumenterModule;
 import datadog.trace.bootstrap.CallDepthThreadLocalMap;
@@ -95,5 +96,11 @@ public static void onExit() {
 
       CallDepthThreadLocalMap.decrementCallDepth(DefaultServerConnection.class);
     }
+
+    // unused method to force the advice to run on driver > 4.0 only
+    public static void muzzleCheck(SessionContext sessionContext) {
+      // moved on 4.0.0
+      sessionContext.getSessionId();
+    }
   }
 }