test.py: print test args when listing failed tests
test.py: print test args when listing failed tests

This can be very helpful when a test only fails when run with some
particular arguments.

Signed-off-by: Botond Dénes <a584fa4d75a0a85d721f44fb6e06315a2853b0b6@scylladb.com>
Message-Id: <dac1f7e23afa904156e65c3bb3c8fd52b7e999ff.1526906955.git.a584fa4d75a0a85d721f44fb6e06315a2853b0b6@scylladb.com>

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