[feature] Complain if local date is old

[nemesifier]

⚠️ Warning!

• Requires more definition and discussion
• Not suited for beginner contributors.
• Patches will be rejected unless consensus is reached first

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The NetJSON DeviceMonitoring object has a "local_time" property which we already collectr.

Having the date out of sync is a common source of issues, eg: failing SSL cert verification, monitoring data aimed at present time saved with past dates and hence not triggering monitoring alerts properly, etc.

We should find a way to alert network admins when this occurs.

[krishvsoni]

@nemesifier Hi! I'd like to work on this issue and be part of the discussion to reach consensus.
Can you assign it to me?

[nemesifier]

@nemesifier Hi! I'd like to work on this issue and be part of the discussion to reach consensus. Can you assign it to me?

I haven't seen you contributing nor participating in any other development activity. Please pick other issues, please read our contrbuting guidelines, it links to a Github board which list issues that are suited for beginner contributors, this is not one of those, I don't feel comfortable having contributors who are inexperienced with OpenWISP touching critical code: it has never been a good idea, this statement comes from my experience fixing mess created by other beginner contributors over the years.