tests/shell: add "random-source.sh" helper for random-source for sort/shuf

Commands `sort` and `shuf` have a "--random-source" argument. That's
useful for generating stable, reproducible "random" output.

However, we want to do this based on a fixed seed, while the
"--random-source" expects a stream of randomness. Add a helper script
for that.

Also, use the stable randomness for shuf in the test
"tests/shell/testcases/sets/automerge_0".

See-also: https://www.gnu.org/software/coreutils/manual/html_node/Random-sources.html#Random-sources

Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>

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