lmp/bb-build: run the setscene-only job as much as possible

[quaresmajose]

This will run all pending do_rm_work task in the bitbake job instead of leaving it for the next job.
This way we don't see do_rm_work task on the next bitbake job that were left here by the previous one.

[quaresmajose]

an example of this some pending do_rm_work tasks can be seen in the following build.
the log is from the last bitbake build step and there are some do_rm_work tasks from the setscene-only step

0:00:01    nettle:do_rm_work
0:00:01    libpng-native:do_rm_work
0:00:01    boost:do_rm_work
0:00:01    lmp-base-console-image:do_rm_work
0:00:01    lmp-base-console-image:do_prepare_recipe_sysroot
0:00:01    dtc-native:do_rm_work
0:00:01    base-files-issue:do_populate_sysroot
0:00:01    base-files-issue:do_package
0:00:02    lmp-base-console-image:do_image_garagecheck
0:00:02    lmp-base-console-image:do_image_garagesign
0:00:02    os-release:do_populate_sysroot
0:00:03    os-release:do_package
0:00:06    lmp-base-console-image:do_image_ostree
0:00:09    lmp-base-console-image:do_image_complete
0:00:10    lmp-base-console-image:do_image_ostreepush
0:00:16    lmp-base-console-image:do_image_ota_ext4
0:00:40    lmp-base-console-image:do_image_ota
0:01:05    lmp-base-console-image:do_image_wic
0:01:35    lmp-base-console-image:do_rootfs
0:02:31    lmp-base-console-image:do_image_ostreecommit

[ricardosalveti]

LGTM