Remove deprecated attributes in order to use python3.
runexported was changed to use python3.
[YOCTO #9702]
(From OE-Core rev: 9129af6dc421455c0253be313bf5781b913dc5fd)
Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>