xfsqa: test 214 leaves files around that cause 236 to fail

xfsqa: test 214 leaves files around that cause 236 to fail

Test 214 and 236 use the same file names for test files in the TEST
filesystem and don't check/create clean initial test state. Hence if
you run 214 then 236, 236 will fail with:

+link: cannot create link `/mnt/test/ouch2' to `/mnt/test/ouch': File exists
+ctime: 1277076527 -> 1277076527
+Fatal error: ctime not updated after link

Ensure that both tests clean up after themselves properly and also
ensure a clean state before they start.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>