BaseTools: Remove equality operator with None

replace "== None" with "is None" and "!= None" with "is not None"

Cc: Yonghong Zhu <yonghong.zhu@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: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/Python/UPT/UPT.py

@@ -90,7 +90,7 @@ def SetLogLevel(Opt):
         Logger.SetLevel(Logger.VERBOSE)
     elif Opt.opt_quiet:
         Logger.SetLevel(Logger.QUIET + 1)
-    elif Opt.debug_level != None:
+    elif Opt.debug_level is not None:
         if Opt.debug_level < 0 or Opt.debug_level > 9:
             Logger.Warn("UPT", ST.ERR_DEBUG_LEVEL)
             Logger.SetLevel(Logger.INFO)