Configure a Mail instance as Email notifications gateway

[stephdl]

Extend the get-smarthost action response with additional attributes.

• The UI code can understand if the smarthost settings point to a Mail module instance by looking at manual_configuration attribute.
• The list of installed Mail instances is returned by the new mail_server attribute.

NethServer/dev#6895

get-smarthost

[root@R4-pve ~]# api-cli run --agent cluster get-smarthost | jq
Warning: using user "cluster" credentials from the environment
{
  "port": 25,
  "host": "10.5.4.1",
  "username": "",
  "password": "",
  "enabled": true,
  "encrypt_smtp": "none",
  "tls_verify": false,
  "mail_server": [
    {
      "mail_id": "mail1",
      "mail_name": "",
      "node": "1",
      "node_name": "",
      "host": "10.5.4.1"
    }
  ],
  "manual_configuration": false
}

For example, to select mail1 and switch to manual _configuration : false pass the IP in host and set port:25.

api-cli run --agent cluster set-smarthost --data '{
  "port": 25,
  "host": "10.5.4.1",
  "username": "",
  "password": "",
  "enabled": true,
  "encrypt_smtp": "none",
  "tls_verify": false
 }'

Other parameters lead to a manual _configuration : true case. E.g.:

api-cli run --agent cluster set-smarthost --data '{
  "port": 587,
  "host": "smtp.domain.com",
  "username": "xxxxx",
  "password": "xxxxx",
  "enabled": true,
  "encrypt_smtp": "starttls",
  "tls_verify": true
 }'