tests: scenarios for rsync's units, pipe scripts, pass changes, statuses

rsync-units checks that rsync's log gives sizes in units of 1024, as
--out-format asks for.  pipe-script runs a pipe command without #!,
which a shell runs as a script.  pass-changes checks that a pass source
gets decrypted again when its store changes, and only then.

A phase's expect.status is the exit status it expects populate to fail
with; git-status checks that populate exits with git fetch's.

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