Security manager instantiation is also prohibited on GAE

Author: michaelklishin

src/com/rabbitmq/client/impl/Environment.java

@@ -1,13 +1,15 @@
 package com.rabbitmq.client.impl;
 
+import java.security.AccessControlException;
+
 /**
  * Infers information about the execution environment, e.g.
  * security permissions.
  */
 class Environment {
     public static boolean isAllowedToModifyThreads() {
-        SecurityManager sm = new SecurityManager();
         try {
+            SecurityManager sm = new SecurityManager();
             sm.checkPermission(new RuntimePermission("modifyThread"));
             sm.checkPermission(new RuntimePermission("modifyThreadGroup"));
             return true;