[merge] use test names in test tmpdir names

[John Arbash Meinel]

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Martin Pool wrote:
| To keep picking away at gc leakage during testing, this goes back to
| using the test case name in the temporary directory name.  Then if it
| is printed in a gc message you have some clue where to look for the
| bug.
|
|
BB:approve

John
=:->

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