DNS script for Linode needs updating for V4 API

[softins]

Describe the bug The DNS scripts for Linode refer to https://api.linode.com/api/, but it appears Linode no longer support this version of API. Instead it is necessary to use https://api.linode.com/v4/ with different endpoints and parameters.

To Reproduce Steps to reproduce the behavior:

I manually created the first curl command issued by dns_add_linode and dns_del_linode:

export TOKEN=<my_token>
curl -X POST https://api.linode.com/api/ -H "Accept: application/json" -H "User-Agent: getssl/0.1" -H "application/x-www-form-urlencoded" -d "api_key=$TOKEN&api_action=domain.list"

The received output indicated 403 Forbidden

I then issued the corresponding command in the V4 API:

curl -H "Authorization: Bearer $TOKEN" https://api.linode.com/v4/domains

This time it gave the expected JSON output.

Operating system (please complete the following information):

• OS: Rocky Linux 8.9
• Bash Version [GNU bash, version 4.4.20(1)-release (x86_64-redhat-linux-gnu)]

Additional context The script will of course need more than just changing the api_url.