Check if certificates needs renewal before create client

[oott123]

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• Yes, I've searched similar issues on GitHub and didn't find any.

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Detailed Description

lego will create a client and log in first, and then check if there are certificates to renew.

If there aren't any certificates renewal required, then no network requests required, so the created client can lead to unnecessary requests, which is not friendly to both users and ACME servers.

If we can check certificates expiry date before any network requests made, we can reduce the resources used by lego.