Logstash syslog parse broken in Docker 1.11+

[gisjedi]

Our logstash syslog parsing is broken as of Docker 1.11 due to a change to use RFC5424. We need to address this in a backwards compatible way within our DockerParams log-opts. Logstash does not have a syslog plugin that supports RFC5424, so we either need to continue on for the foreseeable future with RFC3164 or use a different logging driver.

The associated Docker change can be found here: moby/moby#20121

[gisjedi]

This has gone unnoticed for awhile due to our production instances of Scale using Docker 1.10.x.