Log Message:
Update sysutils/beats to 5.4.0.

==== Bugfixes

Affecting all Beats

- Improve error message when downloading the dashboards fails.
- Fix potential Elasticsearch output URL parsing error if protocol
  scheme is missing.
- Downgrade Elasticsearch per batch item failure log to debug level.
- Make `@timestamp` accessible from format strings.

Filebeat

- Allow log lines without a program name in the Syslog fileset.
- Don't stop Filebeat when modules are used with the Logstash output.

Metricbeat

- Fixing panic on the Prometheus collector when label has a comma.
- Make system process metricset honor the `cpu_ticks` config option.

Winlogbeat

- Fix null terminators include in raw XML string when include_xml is
  enabled.

==== Added

Affecting all Beats

- Update index mappings to support future Elasticsearch 6.X.

Filebeat

- Add auditd module for reading audit logs on Linux.
- Add fileset for the Linux authorization logs.

Heartbeat

- Add default ports in HTTP monitor.

Metricbeat

- Add beta Jolokia module.
- Add dashboard for the MySQL module.
- Module configuration reloading is now beta instead of experimental.
- Marked http fields from the HAProxy module optional to improve
  compatibility with 1.5.
- Add support for custom HTTP headers and TLS for the Metricbeat
  modules.

Packetbeat

- Add DNS dashboard for an overview the DNS traffic.
- Add DNS Tunneling dashboard to highlight domains with large numbers
  of subdomains or high data volume.