The Eot will report error when python3 enabled. We replaced sdict with collections.OrderedDict in python3 patch set, but the sdict implement "append" method which is not implemented in collections.OrderedDict. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Bob Feng <bob.c.feng@intel.com> Cc: Liming Gao <liming.gao@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>