[clang][utils] Make CmpDriver Python3 compatible (#163740)

The majority of this is running 2to3 on it:
* print is a function in 3.x
* next(it) instead of it.next()

Then there was a use of "map(None, iterables..)"
which in Python 2 was a way of saying
"combine these iterables, and if one is shorter,
pad with None".

This no longer works in Python3, the equivalent
is zip_longest:
https://docs.python.org/3/library/itertools.html#itertools.zip_longest

fillvalue defaults to None but I made it explicit
since it may help someone debugging this script
in future.

(I doubt it has been used for a very long time)

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