fix test

Author: nPraml

ebean-datasource/src/test/java/io/ebean/datasource/test/MultipoolTest.java

@@ -62,7 +62,8 @@ public void onBeforeCreateConnection(DataSourcePool pool) {
 			}
 		}
 
-		public void onAfterCloseConnection() {
+    @Override
+    public void onAfterCloseConnection(DataSourcePool pool) {
 			semaphore.release();
 		}