Allow logical interface references in watchcat interface options.
Resolve those names to real netifd devices for ping -I.
Keep logical names for ifup and real-device find_config behavior.
Use separate helpers for ping and restart values to avoid eval.
Treat ModemManager mm_iface_name=null as empty, not a modem name.
Signed-off-by: Dharmik Parmar <dharmikparmar2004@yahoo.com>
(cherry picked from commit dd826b7de6)