BaseTools: fix imports

1 - Some of these imports are cascaded from another file. Import them locally.
2 - Some of these imports are not used. Remove them.
3 - Some of these were missing the namespace used to import them.

These changes facilitate optimization of BaseTools:
https://bugzilla.tianocore.org/show_bug.cgi?id=42

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Source/Python/AutoGen/AutoGen.py

@@ -1,7 +1,7 @@
 ## @file
 # Generate AutoGen.h, AutoGen.c and *.depex files
 #
-# Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2007 - 2019, Intel Corporation. All rights reserved.<BR>
 # Copyright (c) 2018, Hewlett Packard Enterprise Development, L.P.<BR>
 #
 # This program and the accompanying materials
@@ -52,6 +52,7 @@ from .GenVar import VariableMgr, var_info
 from collections import OrderedDict
 from collections import defaultdict
 from Workspace.WorkspaceCommon import OrderedListDict
+from Common.ToolDefClassObject import gDefaultToolsDefFile
 
 from Common.caching import cached_property, cached_class_function
 
@@ -85,9 +86,6 @@ gMakeTypeMap = {TAB_COMPILER_MSFT:"nmake", "GCC":"gmake"}
 ## Build rule configuration file
 gDefaultBuildRuleFile = 'build_rule.txt'
 
-## Tools definition configuration file
-gDefaultToolsDefFile = 'tools_def.txt'
-
 ## Build rule default version
 AutoGenReqBuildRuleVerNum = "0.1"
 

BaseTools/Source/Python/AutoGen/GenC.py

@@ -18,7 +18,7 @@ import string
 import collections
 import struct
 from Common import EdkLogger
-
+from Common import GlobalData
 from Common.BuildToolError import *
 from Common.DataType import *
 from Common.Misc import *

BaseTools/Source/Python/AutoGen/GenPcdDb.py

@@ -22,6 +22,9 @@ from Common.VariableAttributes import VariableAttributes
 import copy
 from struct import unpack
 from Common.DataType import *
+from Common import GlobalData
+from Common import EdkLogger
+import Common.LongFilePathOs as os
 
 DATABASE_VERSION = 7