[PATCH] tests: use find+rm, not perl, to remove temporary directories.

[Karl Berry]

Here's my proposed patch to use chmod and rm -rf (again), instead of
deltree.pl.

In the verbose output in case of failure, I split the difference and
added a terminating line "end ls ...", but did not prefix the ls
output. While I was testing, that seemed the most usable.

Jim, anyone ... look ok? --thanks, karl.

rmrf.diff
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