useradd.bbclass: remove user/group created by the package in clean* task
At present, if a recipe is built which creates users/groups via
useradd.bbclass, those users/groups are not removed from sysroot
when the recipe/package is cleaned using clean/cleansstate/cleanall
or when a recipe is rebuild and 'unstaged' from the the sysroot.
The "userdel_sysroot_sstate()" provides that functionality.
[YOCTO #9262]
Signed-off-by: Maxin B. John <maxin.john@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
