Issue #3242 - Post-review cleanup of ProxyEndPoint

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

jetty-server/src/main/java/org/eclipse/jetty/server/ProxyConnectionFactory.java

@@ -622,7 +622,12 @@ public class ProxyConnectionFactory extends AbstractConnectionFactory
 
         @Override
         public String toString() {
-            return _endp.toString();
+            return String.format("%s@%x[remote=%s,local=%s,endpoint=%s]",
+                    getClass().getSimpleName(),
+                    hashCode(),
+                    _remote,
+                    _local,
+                    _endp);
         }
 
         @Override