dns_edgedns: Replace the ntp.org HTTP GET for retrieving timestamp with builtin _utc_date function.

[tweitzel-akamai]

Previously this plugin would request a timestamp for Akamai OPEN API calls by doing an HTTP GET to ntp.org and grepping the headers. This became unreliable due to DDOS protection on that domain.

The plugin now uses acme.sh's own _utc_date function to request the current UTC time and reformats it according to the requirements (yyyyMMddTHH:mm:ss+0000) at https://developer.akamai.com/legacy/introduction/Client_Auth.html.

Fixes #3973

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[tweitzel-akamai]

I have read the API dev guide and the API test guide, but I am unable to get github actions working in my forked repo and do not know where to get help for it. I have never used github actions before.

[Neilpang]

please push any new changes to your fork to trigger the github actions to run.

[tweitzel-akamai]

I got the tests running but the test fails in openbsd for unknown reasons. All the other systems are working.

[Neilpang]

It's not passing yet:

https://github.com/tweitzel-akamai/acme.sh/actions/runs/3245182644

[tweitzel-akamai]

I'm having a lot of difficulty with openbsd, as can be seen in this run (forgive the massive amounts of printf debugging; I will clean it up before rolling into this PR) https://github.com/tweitzel-akamai/acme.sh/actions/runs/3277730703

Because the openbsd tests do not have iconv or uconv, I have to fall back to perl to encode/decode UTF-8 using code found in the fritzbox deploy plugin.

The output is reporting that diagnostic data is in the "le_test_dnsapi.log" file, but I cannot find this file when I download the logs from the github action. Where is it? Also, is it possible to enable --output-insecure?