Make nmcli to emit a warning if the daemon's version is different to its own version
When updating NetworkManager to a new version, normally the service is not restarted by the installer to avoid interrupting networking. However, next nmcli invocation will use the updated version, but against the older version of the daemon that is still running. Although this is suposed to work, it is advisable that nmcli and daemon's versions are the same. Emit a warning recommending restarting the daemon.
Add nmcli test to check the new feature. To avoid breaking the existing tests, test-networkmanager-service now reports the same version than the running nmcli except if it's instructed to report a different one.
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that: