flake8 E741 variable name warning

Update the zts-report.py script to conform to the flake8 E741 rule.

    "Variables named I, O, and l can be very hard to read. This is
    because the letter I and the letter l are easily confused, and
    the letter O and the number 0 can be easily confused."

- https://www.flake8rules.com/rules/E741.html

Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: John Kennedy <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #10323 

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