Allow more than one DNS server for HA environments #6785

[alexandergott-afk]

This pull request allows you to specify more than one DNS server in this format: IP,IP,IP,IP

It is still possible to specify only one IP address without having to change anything compared to the current configuration.

[github-actions]

Welcome
READ ME !!!!!
Read me !!!!!!
First thing: don't send PR to the master branch, please send to the dev branch instead.
Please read the DNS API Dev Guide.
You MUST pass the DNS-API-Test.
Then reply on this message, otherwise, your code will not be reviewed or merged.
Please also make sure to add/update the usage here: https://github.com/acmesh-official/acme.sh/wiki/dnsapi2
注意: 必须通过了 DNS-API-Test 才会被 review. 无论是修改, 还是新加的 dns api, 都必须确保通过这个测试.

[alexandergott-afk]

Welcome READ ME !!!!! Read me !!!!!! First thing: don't send PR to the master branch, please send to the dev branch instead. Please read the DNS API Dev Guide. You MUST pass the DNS-API-Test. Then reply on this message, otherwise, your code will not be reviewed or merged. Please also make sure to add/update the usage here: https://github.com/acmesh-official/acme.sh/wiki/dnsapi2 注意: 必须通过了 DNS-API-Test 才会被 review. 无论是修改, 还是新加的 dns api, 都必须确保通过这个测试.

ok