BaseTools: Handle the bytes and str difference

Deal with bytes and str is different, remove the unicode(),
correct open file parameter.
Using utcfromtimestamp instead of fromtimestamp.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Source/Python/AutoGen/InfSectionParser.py

@@ -34,7 +34,7 @@ class InfSectionParser():
         SectionData = []
 
         try:
-            FileLinesList = open(self._FilePath, "r", 0).readlines()
+            FileLinesList = open(self._FilePath, "r").readlines()
         except BaseException:
             EdkLogger.error("build", AUTOGEN_ERROR, 'File %s is opened failed.' % self._FilePath)