Fix Flaky test HtmlAccelServletTest.testHtmlAccelRewriteChain (issue1234041)

[zhoresh]

Reviewers: shindig.remailer_gmail.com,

Description:
Improve the test to handle timing

Please review this at http://codereview.appspot.com/1234041/show

Affected files:
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/HtmlAccelServletTest.java


### Eclipse Workspace Patch 1.0
#P shindig-project
Index:  
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/HtmlAccelServletTest.java
===================================================================
---  
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/HtmlAccelServletTest.java	 
(revision 944496)
+++  
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/HtmlAccelServletTest.java	 
(working copy)
@@ -140,7 +140,8 @@
     assertEquals("accel", req.getContainer());
     assertEquals(REWRITE_CONTENT, recorder.getResponseAsString());
     assertEquals(200, recorder.getHttpStatusCode());
-    assertEquals("private,max-age=566",  
recorder.getHeader("Cache-Control"));
+     
assertTrue(recorder.getHeader("Cache-Control").equals("private,max-age=566")
+        ||  
recorder.getHeader("Cache-Control").equals("private,max-age=567"));
     // Note: due to rounding (MS to S conversion), ttl is down by 1
   }