cloud-init not select `NetworkManager` renderer if `/etc/NetworkManager/NetworkManager.conf` absents

[王煎饼]

Bug report

https://download.opensuse.org/tumbleweed/appliances/openSUSE-Tumbleweed-Minimal-VM.x86_64-Cloud.qcow2
This image have NetworkManager installed. No networkd installed.
But Cloud-init selects networkd renderer instead of NetworkManager

Due to

cloud-init not select NetworkManager renderer if /etc/NetworkManager/NetworkManager.conf absents

Fix

When select renderers

• NetworkManager: Don't check if /etc/NetworkManager/NetworkManager.conf exists
• networkd: Check if systemd-networkd services exists

[James Falcon]

Thanks for the bug report!