rawhide install shadow-utils for usermod

Using `kiwi-ng` version 10.2.18 (EL9)

Currently with:

```
sudo kiwi-ng system build \
   --description kiwi/build-tests/x86/fedora/test-image-docker
   --set-repo http://ftp.fau.de/fedora/linux/development/rawhide/Everything/x86_64/os/ \
   --target-dir /tmp/myimage1
```

This fails with:

```
[ INFO    ]: 09:46:38 | Setting up user root
[ INFO    ]: 09:46:38 | --> Modifying user: root
[ INFO    ]: 09:46:38 | --> Primary group for user root: root
[ ERROR   ]: 09:46:38 | KiwiCommandError: chroot: stderr: /sbin/chroot: failed to run command ‘usermod’: No such file or directory
```

Install the package `shadow-utils` to provide `usermod`.

build-tests/x86/fedora/test-image-docker/appliance.kiwi

@@ -31,6 +31,7 @@
         <package name="vim"/>
         <package name="tzdata"/>
         <package name="NetworkManager"/>
+        <package name="shadow-utils"/>
     </packages>
     <packages type="bootstrap">
         <package name="filesystem"/>