[review] Support connection checks in DirectIP (sierra-legacy plugin)

[Aleksander Morgado]

Hey,

Devices like the AC313U require explicit context monitoring with !SCACT?.
Otherwise, we may end up with the modem reported as connected in MM, with
IP settings in the network interface and all, but without a real connection
inside the modem.

This MR implements the support for this periodic !SCACT checks:
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/merge_requests/45

-- 
Aleksander
https://aleksander.es
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