SSL Keystore/Truststore Types

[markush81]

Currently the config allows to set

input {
  kafka {
    topics => ["topic"]
    bootstrap_servers => "localhost:9093"
    ssl => true
    ssl_keystore_location => "server.jks"
    ssl_keystore_password => "pwd"
    ssl_truststore_location => "server.jks"
    ssl_truststore_password => "pwd"
  }
}

but no

input {
  kafka {
       .
    ssl_keystore_type => "JCEKS"
    ssl_truststore_type => "JCEKS"
  }
}

which would be very helpful. Default is JKS in Kafka, but we for example need JCEKS.

I tested now and patch file is logstash_input_kafka_ssl_patch.txt as well as created pull request #142.