By switching from print() to bb.plain() to print failing task logs, we
allow them to be saved in BB_CONSOLELOG.
Fixes [YOCTO #15798]: This allows AB reproducibility test to save the
full log of the failing tasks and helps debugging.
(Bitbake rev: d3b3ad32da7c7ebf61814fc807f8667a37aa149b)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>