test/alternator: remove slow and unhelpful test
test/alternator: remove slow and unhelpful test

The test test_table.py::test_table_streams_on creates tables with various
stream types, and then immediately deletes them without testing anything.
This is a slow test (taking almost a full second on my laptop), and is
redundant because in test_streams.py we have tests which create tables
with streams in the same way - but then actually test that things work
with these streams. So this test might as well be removed, and this is
what we do in this patch.

Removing this test shaves another second from the Alternator test suite's
run time.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>
Message-Id: <20210317230530.1780849-1-625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>

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