fix tests to work with --dur

Author: agirbal

src/test/com/mongodb/ErrorTest.java

@@ -56,7 +56,7 @@ public void testLastErrorWithConcern()
         _db.resetError();
         CommandResult cr = _db.getLastError(WriteConcern.FSYNC_SAFE);
         assert(cr.get("err") == null);
-        assert(cr.containsField("fsyncFiles"));
+        assert(cr.containsField("fsyncFiles") || cr.containsField("waited"));
     }
 
     @Test

src/test/com/mongodb/JavaClientTest.java

@@ -610,7 +610,7 @@ public void testWriteResultWithGetLastErrorWithDifferentConcerns(){
 
         CommandResult cr = res.getLastError( WriteConcern.FSYNC_SAFE );
         assertEquals( 1 , cr.getInt( "n" ) );
-        assertTrue( cr.containsField( "fsyncFiles" ));
+        assertTrue( cr.containsField( "fsyncFiles" ) || cr.containsField( "waited" ));
 
         CommandResult cr2 = res.getLastError( WriteConcern.FSYNC_SAFE );
         assertTrue( cr == cr2 );