Some open rsync tests fail when run as regular user. If running
as root, switch to build user to cover that case with new test13b_perms.
Fix the original test6_perms and test13_perms to pass as root

Some open rsync tests fail when run as regular user. If running
as root, switch to build user to cover that case with new test13b_perms.
Fix the original test6_perms and test13_perms to pass as root and
regular user. Note that ports rsync does not have this problem.

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Make remaining unstable tests fail consistently by adjusting the
modification time of the problematic file(s), causing the check_file()
routine to always hit the "file exists and is possible match" c

Make remaining unstable tests fail consistently by adjusting the
modification time of the problematic file(s), causing the check_file()
routine to always hit the "file exists and is possible match" case.

While here, sync expected failures with reality.

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Run open rsync and ports rsync programs against each other using
the --rsync-path option. So we can see whether the tests pass in
all interoperability combinations.
Suggested by claudio@

Execute each test as make target. Remove the shell wrapper. Mark
failing test so that claudio@ can fix them.

Import rsync regress provided by Martin Cracauer so that bluhm@ can work
improve it in tree.