ngie 81b0e470dd Fix up concurrent test zpool setup and teardown
Set up zpools with a more unique name, stash the zpool name away in a file pointed
to by `$ZPOOL_NAME_FILE` (which is relative to a per-testcase generated temporary
directory), then remove the file based on `$ZPOOL_NAME_FILE` in the cleanup
routines.

This is a more concurrency-safe solution and will allow the testcases to be safely
executed in parallel.

Reviewed by:	kevans, jtl
Approved by:	jtl (mentor)
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D19024
2019-02-12 23:35:46 +00:00
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