test/alternator: improve comment on why we need "global_random"
test/alternator: improve comment on why we need "global_random"

Improve the comment that explains why we needed to use an explicitly
shared random sequence instead of the usual "random". We now understand
that we need this workaround to undo what the pytest-randomly plugin does.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>
Message-Id: <20220130155557.1181345-1-625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>

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