test.py: do not disable human-readable format with --jenkins flag
test.py: do not disable human-readable format with --jenkins flag

When test.py is run with --jenkins flag Boost UTF is asked to generate
an XML file with the test results. This automatically disables the
human-readable output printed to stdout. There is no real reason to do
so and it is actually less confusing when the Boost UTF messages are in
the test output together with Scylla logger messages.

Message-Id: <3abc1987389336149c4f1c7ab16225220f3aa4cc@scylladb.com>

scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla,duarten/scylla,duarten/scylla