Add Kafka 0.9+ consumer support (#2487)

plugins/inputs/kafka_consumer/README.md

@@ -6,6 +6,9 @@ line protocol. [Consumer Group](http://godoc.org/github.com/wvanbergen/kafka/con
 is used to talk to the Kafka cluster so multiple instances of telegraf can read
 from the same topic in parallel.
 
+For old kafka version (< 0.8), please use the kafka_consumer_legacy input plugin
+and use the old zookeeper connection method.
+
 ## Configuration
 
 ```toml
@@ -13,15 +16,23 @@ from the same topic in parallel.
 [[inputs.kafka_consumer]]
   ## topic(s) to consume
   topics = ["telegraf"]
-  ## an array of Zookeeper connection strings
-  zookeeper_peers = ["localhost:2181"]
-  ## Zookeeper Chroot
-  zookeeper_chroot = ""
+  brokers = ["localhost:9092"]
   ## the name of the consumer group
   consumer_group = "telegraf_metrics_consumers"
   ## Offset (must be either "oldest" or "newest")
   offset = "oldest"
 
+  ## Optional SSL Config
+  # ssl_ca = "/etc/telegraf/ca.pem"
+  # ssl_cert = "/etc/telegraf/cert.pem"
+  # ssl_key = "/etc/telegraf/key.pem"
+  ## Use SSL but skip chain & host verification
+  # insecure_skip_verify = false
+
+  ## Optional SASL Config
+  # sasl_username = "kafka"
+  # sasl_password = "secret"
+
   ## Data format to consume.
   ## Each data format has its own unique set of configuration options, read
   ## more about them here: