Minor code cleanups in arc_python.py

Remove unused library re and associated variable kstat_pobj. Add note
to documentation at start of program about required support for old
versions of Python. Change variable "format" (which is a built-in
function) to "fmt".

Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Scot W. Stevenson <[email protected]>
Closes #6869 

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