Writing qemuboot.conf in write_qemuboot_conf() does not modify the
rootfs and thus conceptually shouldn't be executed as part of rootfs
creation.
Running it as separate task is cleaner and fixes the problem of
missing qemuboot.conf files for meta-swupd virtual images; those
images replace do_rootfs and ROOTFS_POSTPROCESS_COMMANDs don't run at
all.
The task gets added such that it runs roughly at the same time as
before. Probably it doesn't actually need to depend on do_rootfs, but
this way we don't write a useless qemuboot.conf in cases where
do_rootfs fails.
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
