Do not add NetworkManager bundle to image when systemd-networked is already in the bundle list.

**Is your feature request related to a problem? Please describe.**
if I require a bundle for networking, it seems redundant to add another.

**Describe the solution you'd like**
Do not add NetworkManager if systemd-networked  is already in the list of bundles.

**Describe alternatives you've considered**

**Additional context**

