Revert BaseTools: PYTHON3 migration

This reverts commit 6693f359b3c213513c5096a06c6f67244a44dc52..
678f851312.

Python3 migration is the fundamental change. It requires every developer
to install Python3. Before this migration, the well communication and wide
verification must be done. But now, most people is not aware of this change,
and not try it. So, Python3 migration is reverted and be moved to edk2-staging
Python3 branch for the edk2 user evaluation.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>

BaseTools/Scripts/PackageDocumentTools/plugins/EdkPlugins/edk2/model/doxygengen_spec.py

@@ -13,7 +13,7 @@
 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
-from ...basemodel import doxygen
+import plugins.EdkPlugins.basemodel.doxygen as doxygen
 import os
 try:
     import wx
@@ -21,9 +21,9 @@ try:
 except:
     gInGui = False
 import re
-from ..model import inf
-from ..model import dec
-from ...basemodel.message import *
+import plugins.EdkPlugins.edk2.model.inf as inf
+import plugins.EdkPlugins.edk2.model.dec as dec
+from plugins.EdkPlugins.basemodel.message import *
 
 _ignore_dir = ['.svn', '_svn', 'cvs']
 _inf_key_description_mapping_table = {
@@ -388,7 +388,7 @@ class PackageDocumentAction(DoxygenAction):
         configFile.AddFile(path)
         return
         no = 0
-        for no in range(len(lines)):
+        for no in xrange(len(lines)):
             if len(lines[no].strip()) == 0:
                 continue
             if lines[no].strip()[:2] in ['##', '//', '/*', '*/']:
@@ -1003,7 +1003,7 @@ class PackageDocumentAction(DoxygenAction):
         #file = textfile.TextFile(path)
 
         try:
-            file = open(path, 'r')
+            file = open(path, 'rb')
         except (IOError, OSError) as msg:
             return None