Add config options for Kafka output to libbeat.yml

[ruflin]

No description provided.

[lcanfield]

currently, the kafka output fails with

2016-03-21T21:04:13Z ERR Invalid kafka configuration: kafka: invalid configuration (Producer.Timeout must be > 0)
2016-03-21T21:04:13Z ERR failed to initialize kafka plugin as output: kafka: invalid configuration (Producer.Timeout must be > 0)
2016-03-21T21:04:13Z CRIT Start error: error Initialising publisher: kafka: invalid configuration (Producer.Timeout must be > 0)

This began with merges on 3/1 for the 1.1.2 release.

Seems to be related to 5ef56c0

[urso]

@lcanfield can you please create a new issue including some more details (run with -e -d '*') and share config. I almost missed your comment.

[lcanfield]

@urso #1215

[tsg]

This was done a while ago.