Ability to enable/disable Auto Topic Creation in Kafka input plugin.

[e-parth-pathak]

• The Logstash Kafka input plugin should have the ability to enable/disable the auto creation of topics from the Consumer (logstash).
• Users who have enabled auto topic creation in Kafka so that topics are automatically created when a event is produced should also be allowed to enable OR disable the same from Logstash's end.
• The downside of this autocreation function is that topics can also be created by a consumers. This makes it difficult to remove topics that no longer produce events. There wasn't a property for this in the logstash's Kafka input plugin documentation.

Documentation ref: https://cwiki.apache.org/confluence/display/KAFKA/KIP-361%3A+Add+Consumer+Configuration+to+Disable+Auto+Topic+Creation

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Closes: https://github.com/logstash-plugins/logstash-integration-kafka/issues/171

[jsvd]

@logstashmachine bump minor

[e-parth-pathak]

Closes https://github.com/logstash-plugins/logstash-integration-kafka/issues/171.