Add missing futures for ConsumeKafka

The new ConsumeKafka processor is missing some capabilities that were present in old getKafka processor.
1. New ConsumeKafka is not writing critical Kafka attributes i.e., kafka.key, kafka.offset, kafka.partition etc into flowFile attributes.

Old getKafka processor:

Standard FlowFile Attributes
Key: 'entryDate'
Value: 'Sun Jul 17 15:17:00 CDT 2016'
Key: 'lineageStartDate'
Value: 'Sun Jul 17 15:17:00 CDT 2016'
Key: 'fileSize'
Value: '183'
FlowFile Attribute Map Content
Key: 'filename'
Value: '19709945781167274'
Key: 'kafka.key'
Value: '{"database":"test","table":"sc_job","pk.systemid":1}'
Key: 'kafka.offset'
Value: '1184010261'
Key: 'kafka.partition'
Value: '0'
Key: 'kafka.topic'
Value: ‘data'
Key: 'path'
Value: './'
Key: 'uuid'
Value: '244059bb-9ad9-4d74-b1fb-312eee72124a'

New ConsumeKafka processor :

Standard FlowFile Attributes
Key: 'entryDate'
Value: 'Sun Jul 17 15:18:41 CDT 2016'
Key: 'lineageStartDate'
Value: 'Sun Jul 17 15:18:41 CDT 2016'
Key: 'fileSize'
Value: '183'
FlowFile Attribute Map Content
Key: 'filename'
Value: '19710046870478139'
Key: 'path'
Value: './'
Key: 'uuid'
Value: '349fbeb3-e342-4533-be4c-424793fa5c59’

2. getKafka/petKafka are compatible with Kafka 0.8.x and 0.9.x .
Please make new PublishKafka/ConsumeKafka processors based on Kafka 0.10 version.

3. Support subscribing to multiple topics i.e., topic: topic1,topic2

4. Support configurable Serializer/DeSerializer for String, JSON , Avro etc.