Add support for managing loopback devices with Network Manager

[Aethylred]

This addresses Issue #162

Updates the ethernet_nmconnect.j2 template to handle loopback devices, and updates the ether checks to pass them.

It should work for the default lo loopback device, but might need more work to handle other loopback devices if configured.

[Aethylred]

I'm not entirely happy with the handler

elif [[ '{{ interface }}' == 'lo' ]]; then

This should really by interface type and not interface name, but I don't know how or if that variable is exposed in the handler playbook

[markgoddard]

Hi @michaelrigart would you be able to import the new v1.15.0 release?

[michaelrigart]

@markgoddard, should be available now!