title: kafka-avro-console-producer Quick Start fails
body: <p>I'm using <code>kafka-avro-console-producer</code> from confluent-3.0.0 and error occurs when I execute the following:</p>
  
  <pre><code>./bin/kafka-avro-console-producer --broker-list localhost:9092 --topic test1234 --property value.schema='{"type":"record","name":"myrecord","fields":[{"name":"f1","type":"string"}]}'
  SLF4J: Class path contains multiple SLF4J bindings.
  SLF4J: Found binding in [jar:file:/Users/tonydao/dev/bin/confluent-3.0.0/share/java/kafka-serde-tools/slf4j-log4j12-1.7.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
  SLF4J: Found binding in [jar:file:/Users/tonydao/dev/bin/confluent-3.0.0/share/java/confluent-common/slf4j-log4j12-1.7.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
  SLF4J: Found binding in [jar:file:/Users/tonydao/dev/bin/confluent-3.0.0/share/java/schema-registry/slf4j-log4j12-1.7.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
  SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
  SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
  {"f1":"value1"}
  {"f1":"value2"}
  
  org.apache.kafka.common.errors.SerializationException: Error deserializing json  to Avro of schema {"type":"record","name":"myrecord","fields":[{"name":"f1","type":"string"}]}
  Caused by: java.io.EOFException
      at org.apache.avro.io.JsonDecoder.advance(JsonDecoder.java:138)
      at org.apache.avro.io.JsonDecoder.readString(JsonDecoder.java:219)
      at org.apache.avro.io.JsonDecoder.readString(JsonDecoder.java:214)
      at org.apache.avro.io.ResolvingDecoder.readString(ResolvingDecoder.java:201)
      at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:363)
      at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:355)
      at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:157)
      at org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:193)
      at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:183)
      at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:151)
      at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
      at io.confluent.kafka.formatter.AvroMessageReader.jsonToAvro(AvroMessageReader.java:189)
      at io.confluent.kafka.formatter.AvroMessageReader.readMessage(AvroMessageReader.java:157)
      at kafka.tools.ConsoleProducer$.main(ConsoleProducer.scala:55)
      at kafka.tools.ConsoleProducer.main(ConsoleProducer.scala)
  </code></pre>