[PATCH 0/3] moving test trash directories

This series adds support for making trash directories for the test
scripts outside of the usual hierarchy. The main benefit is improved
performance. By putting the trash directories onto a tmpfs (rather than
SATA disks), my "make -j32 test" time went from around 1m51s to around
1m01s. I can only imagine what improvement it would have for people on
NFS.  :)

It also has the nice side effect that running the test suite doesn't
thrash your disk as much, in case you wanted to do something else while
it was running.

  [1/3] tests: use "$TEST_DIRECTORY" instead of ".."
  [2/3] tests: provide $TRASH_DIRECTORY variable
  [3/3] tests: allow user to specify trash directory location

-Peff