BaseTools: refactor and remove out of date use of .keys()

this is no longer required to make dictionary objects iterable.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@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/build/build.py

@@ -1423,9 +1423,7 @@ class Build():
     def _RebaseModule (self, MapBuffer, BaseAddress, ModuleList, AddrIsOffset = True, ModeIsSmm = False):
         if ModeIsSmm:
             AddrIsOffset = False
-        InfFileNameList = ModuleList.keys()
-        #InfFileNameList.sort()
-        for InfFile in InfFileNameList:
+        for InfFile in ModuleList:
             sys.stdout.write (".")
             sys.stdout.flush()
             ModuleInfo = ModuleList[InfFile]