Bug#816384: systemd: Systemd tries to rename ppp interface when .link files present for existing NICs

[Vladimir K]

The thing is, as far as I remember when network units were in place, even 
before reboot, the system tried to apply them to any newly appeared interface, 
i.e. created by tinc or pptp, despite MAC filter. Anyway, now it does not, so 
it fixed.