traceback2 adds traceback for python2. Rather than depend on traceback2, we're
python3 only so just use traceback.
This caused breakage in oe-selftest -j which uses testtools on the autobuilder
using buildtools-tarball.
[YOCTO #13652]
(From OE-Core rev: ee80a06c107375e3cf0d246ea17c09dda4536dab)
(From OE-Core rev: 9f51e83ab407c3dff6624b6ae1b03ca6c326d382)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(From OE-Core rev: 114e23298420df3bdac48c6a2b628164f1d825f8)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
