Merge ~slyon/snappy-hwe-snaps/+git/network-manager:slyon/netplan-modify-connections into ~snappy-hwe-team/snappy-hwe-snaps/+git/network-manager:snap-20

Update netplan integration patch

If existing connections are being modified via 'nmcli' netplan does not know
about the existing netdef_id, as the path to the keyfile is not in the format
'run/NetworkManager/system-connections/netplan-*.nmconnection'

If there is an previous existing netplan connection, make sure to pass the new
keyfile, but at the location/path of the old connection profile, so that
netplan is able to derive the original netdef_id.

Also, make the full:immutable-netplan-config a bit more robust, by avoiding the volatile connection profile generated by NM. And avoid deleting non-netplan (e.g. volatile) connections via libnetplan.

Update netplan integration patch

If existing connections are being modified via 'nmcli' netplan does not know
about the existing netdef_id, as the path to the keyfile is not in the format
'run/NetworkManager/system-connections/netplan-*.nmconnection'

If there is an previous existing netplan connection, make sure to pass the new
keyfile, but at the location/path of the old connection profile, so that
netplan is able to derive the original netdef_id.

Also, make the full:immutable-netplan-config a bit more robust, by avoiding the volatile connection profile generated by NM. And avoid deleting non-netplan (e.g. volatile) connections via libnetplan.