Invalid namespace tests needs STANDALONE

In b29c423 for PHPC-1057, Manager's execute methods were changed to perform server selection before invoking the phongo_execute functions, which throw InvalidArgumentExceptions such as this. Without a running standalone server, this test will encounter a server selection failure before we have a chance to parse the namespace string.

Author: jmikola

tests/manager/manager-invalidnamespace.phpt

@@ -2,6 +2,7 @@
 MongoDB\Driver\Manager: Invalid namespace
 --SKIPIF--
 <?php require __DIR__ . "/../utils/basic-skipif.inc"?>
+<?php NEEDS('STANDALONE'); ?>
 --FILE--
 <?php
 require_once __DIR__ . "/../utils/basic.inc";

tests/standalone/bug0357.phpt

@@ -2,6 +2,7 @@
 PHPC-357: The exception for "invalid namespace" does not list the broken name
 --SKIPIF--
 <?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
+<?php NEEDS('STANDALONE'); ?>
 --FILE--
 <?php
 require_once __DIR__ . "/../utils/basic.inc";