shadow-native: use 'users' group by default

The rootfs has 'users' group at number 100 and without this fix it
would assign to a non-existent group and if a group with gid as 1000
is created later it would own all files for users created.

(From OE-Core rev: e06414092c7aa4fce1173f00e610a33a0deca9cd)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/shadow/shadow-native_4.1.4.3.bb

@@ -7,7 +7,7 @@ LICENSE = "BSD | Artistic-1.0"
 LIC_FILES_CHKSUM = "file://COPYING;md5=08c553a87d4e51bbed50b20e0adcaede \
                     file://src/passwd.c;firstline=8;endline=30;md5=2899a045e90511d0e043b85a7db7e2fe"
 
-PR = "r6"
+PR = "r7"
 
 SRC_URI = "http://pkg-shadow.alioth.debian.org/releases/${BPN}-${PV}.tar.bz2 \
            file://shadow.automake-1.11.patch \
@@ -46,4 +46,7 @@ do_install_append() {
 	# Now we don't have a mail system. Disable mail creation for now.
 	sed -i 's:/bin/bash:/bin/sh:g' ${D}${sysconfdir}/default/useradd
 	sed -i '/^CREATE_MAIL_SPOOL/ s:^:#:' ${D}${sysconfdir}/default/useradd
+
+	# Use users group by default
+	sed -i 's,^GROUP=1000,GROUP=100,g' ${D}${sysconfdir}/default/useradd
 }