Cherry-pick #21854 to 7.x: Fix syslog RFC 5424 parsing in CheckPoint module

[andrewkroh]

Cherry-pick of PR #21854 to 7.x branch. Original message:

What does this PR do?

Change the input type in the CheckPoint module to udp from syslog
so the syslog parsing happens in the ingest node pipeline rather than
in the Filebeat syslog input that only support RFC 3164.

Why is it important?

The module was causing warnings while parsing data.

Checklist

• My code follows the style guidelines of this project
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

1. Enable module.
2. echo -n '<134>1 2020-03-29T13:19:21Z gw-da58d3 CheckPoint 1930 - [flags:"133440"; ifdir:"inbound"; ifname:"daemon"; loguid:"{0x5e80a059,0x2,0x6401a8c0,0x3c7878a}"; origin:"192.168.1.100"; sequencenum:"2"; version:"5"; product:"System Monitor"; sys_message::"installed Standard"]' | nc -4u -w1 localhost 9001
3. Check Elasticsearch.

Related issues

• Relates Syslog input to support RFC5424 #6872

Logs

I manually tested the syslog parsing using the steps above and this is the event that landed in ES.

{
          "checkpoint" : {
            "sys_message" : "installed Standard"
          },
          "agent" : {
            "name" : "mac",
            "id" : "a92a047c-c6c6-4025-8933-1672a1b99ae1",
            "type" : "filebeat",
            "ephemeral_id" : "658300b1-a9a5-45b9-b9ab-14c09edcee16",
            "version" : "8.0.0"
          },
          "log" : {
            "source" : {
              "address" : "127.0.0.1:60816"
            }
          },
          "fileset" : {
            "name" : "firewall"
          },
          "tags" : [
            "checkpoint-firewall",
            "forwarded"
          ],
          "network" : {
            "direction" : "inbound"
          },
          "input" : {
            "type" : "udp"
          },
          "observer" : {
            "ingress" : {
              "interface" : {
                "name" : "daemon"
              }
            },
            "product" : "System Monitor",
            "vendor" : "Checkpoint",
            "name" : "192.168.1.100",
            "type" : "firewall"
          },
          "@timestamp" : "2020-03-29T13:19:21.000Z",
          "ecs" : {
            "version" : "1.6.0"
          },
          "service" : {
            "type" : "checkpoint"
          },
          "event" : {
            "sequence" : 2,
            "ingested" : "2020-10-15T13:41:59.409604500Z",
            "timezone" : "-04:00",
            "created" : "2020-10-15T13:41:55.836Z",
            "kind" : "event",
            "module" : "checkpoint",
            "id" : "{0x5e80a059,0x2,0x6401a8c0,0x3c7878a}",
            "category" : [
              "network"
            ],
            "dataset" : "checkpoint.firewall"
          }
        }

[elasticmachine]

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• Build Cause: [Pull request #21865 opened]

• Start Time: 2020-10-15T19:36:13.756+0000

• Duration: 74 min 52 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4429
Skipped	567
Total	4996