Update tools/flakes to work with pydoc

Change-Id: Ib141553017aa88d6edb65b5d51c06740699a2480

flakes.py

@@ -1,16 +1,16 @@
-import __builtin__
-import os
-import sys
-
-from pyflakes.scripts.pyflakes import main
-
 """
  wrapper for pyflakes to ignore gettext based warning:
      "undefined name '_'"
 
  From https://bugs.launchpad.net/pyflakes/+bug/844592
 """
+import __builtin__
+import os
+import sys
 
+from pyflakes.scripts.pyflakes import main
+
+if __name__ == "__main__":
     names = os.environ.get('PYFLAKES_BUILTINS', '_')
     names = [x.strip() for x in names.split(',')]
     for x in names: