oldconfig: Use Kconfig.node_iter() and clean up

Some general cleanup:

 - Handle the iteration with the new Kconfig.node_iter() helper.

   This makes some function so short that they become pointless. Have
   just main() + oldconfig(node) + small helper functions.

 - Use _name_and_loc_str(sc) for choices too, so that all locations get
   reported for named choices defined in multiple locations

 - Rewrite the intro to be less wordy and remove the sample session
   (leftover from when oldconfig.py was in examples/, and not that
   exciting)

 - Print "Updated configuration written to..." instead of
   "Configuration saved to..."

 - Various other nits

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