oeqa/oelib/path: don't leak temporary directories
setUp() is used to populate a directory of temporary files, and deleted in
__del__. However setUp() is called once *per test* so __del__ would only be
able to remove the last directory created.
Fix the code by using the natural counterpart to setUp, tearDown(), to clean up.
(From OE-Core rev:
68b4723e6fb11d171869185bccf28f32f6284c18)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
