utility-tasks: Add recideptask flag for fetchall/checkuriall

See the bitbake commit adding the recideptask flag for details of the
problem but in summary, we weren't seeing the [depends] of tasks like
do_rootfs being taking into account for fetchall. This was leading
to not all sources being fetched and this is the OE-Core part of the
fix for this problem.

BB_DEFAULT_TASK is the default task used since this is the one that
most commands would end up targeting and is how users expect the command
to behave.

[YOCTO #4597]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>