FreeNAS/freenas 87cd47fsrc/middlewared/middlewared/alert/source ntp_status.py

Add NTP alert, in case peer is not reachable (#1540)

* Add NTP alert, in case peer is not reachable, as well as some other
related sanity checks. More thorough ones can be derived.

Ticket: #21458
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+239-0src/middlewared/middlewared/alert/source/ntp_status.py
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