Its hard to see what this exception adds in the current codebase. The logfile
attribute is effectively ignored, the exception doesn't serve a defined
purpose and mostly seems to be worked around.
Remove it entirely. If this does cause output problems, we'll figure
out better ways to address those.
(Bitbake rev: cfeffb602dd5319f071cd6bcf84139ec77f2d170)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>