BaseTools: Use absolute import in Common

Based on "futurize -f libfuturize.fixes.fix_absolute_import

Contributed-under: TianoCore Contribution Agreement 1.1
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

BaseTools/Source/Python/Common/Parsing.py

@@ -14,9 +14,10 @@
 ##
 # Import Modules
 #
-from StringUtils import *
+from __future__ import absolute_import
+from .StringUtils import *
 from CommonDataClass.DataClass import *
-from DataType import *
+from .DataType import *
 
 ## ParseDefineMacro
 #