useradd: remove preinst script referring to recipe sysroot
Remove recipe-specific-sysroot details from the preinst scripts
generated by useradd.bbclass.
This was added to match the default from bitbake.conf. Unlike the default
case, the dependencies used by useradd mean that a default passwd/group
file is always present. This means we don't need the native sysroot fallback.
Fixes [YOCTO #11460]
Signed-off-by: Maxin B. John <maxin.john@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
