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/Workspace/BuildClassObject.py

@@ -94,13 +94,13 @@ class PcdClassObject(object):
                         deme = ArrayIndex.findall(demesionattr)
                         for i in range(len(deme)-1):
                             if int(deme[i].lstrip("[").rstrip("]").strip()) > int(self._Capacity[i]):
-                                print "error"
+                                print ("error")
         if hasattr(self,"DefaultValues"):
             for demesionattr in self.DefaultValues:
                 deme = ArrayIndex.findall(demesionattr)
                 for i in range(len(deme)-1):
                     if int(deme[i].lstrip("[").rstrip("]").strip()) > int(self._Capacity[i]):
-                        print "error"
+                        print ("error")
         return self._Capacity
     @property
     def DatumType(self):