FortiGate event handler DHCP parser

[fdurand]

Description

Add the ability to parse the syslog messages coming from the fortigate firewall to update the ip4log information.

Impacts

No

Delete branch after merge

YES

Checklist

• Document the feature
• Add OpenAPI specification
• Add unit tests
• Add acceptance tests (TestLink)

NEWS file entries

New Features

• FortiGate syslog DHCP parser

[jrouzierinverse]

Don't iterate through all the fields on the map.
Just grab the value you need

mac = strings.ToLower(attributes["mac"])
ip = attributes["ip"]
...

If you need to do it conditionally

if value, ok := attributes["mac"]; ok {
    mac = strings.ToLower(value)
}

if value, ok := attributes["ip"]; ok {
    ip = strings.ToLower(value)
}

...