python: Stop use of tuple parameter unpacking

python: Stop use of tuple parameter unpacking

Python 3 removed support for tuple parameter unpacking.

https://www.python.org/dev/peps/pep-3113/

Instead of:

    def foo((a, b)):
        print(a)
        print(b)

you should do:

    def foo(a_b):
        a, b = a_b
        print(a)
        print(b)

but in both uses here, the values were never used so the fix is even
simpler.

Signed-off-by: Russell Bryant <russell@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>