make fio scripts python3-ready
Many distributions are moving to python3 by default. Here's
an attempt to make the python scripts in fio python3-ready.
Conversion was facilitated with automated tools. A few areas
were hand fixed: remove superfluous parentheses introduced by
2to3 converter in print function calls, shebang modifications
to use environment variable for python version, and byte-string
decode correction in steadystate_tests.py following 2to3
conversion.
The modified scripts pass rudimentary testing when run under
python2.7 as well as python3.
Signed-off-by: Bill O'Donnell <billodo@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>