Review Request 30482: Add the coordinator to server

[Guozhang Wang]

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Review request for kafka.


Bugs: KAFKA-1633
    https://issues.apache.org/jira/browse/KAFKA-1633


Repository: kafka


Description
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TBD


Diffs
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  core/src/main/scala/kafka/coordinator/ConsumerCoordinator.scala PRE-CREATION 
  core/src/main/scala/kafka/coordinator/GroupRegistry.scala PRE-CREATION 
  core/src/main/scala/kafka/coordinator/HeartbeatBucket.scala PRE-CREATION 
  core/src/main/scala/kafka/server/DelayedOperationKey.scala 
fb7e9ed5c16dd15b71e1b1ac12948641185871db 
  core/src/main/scala/kafka/server/KafkaApis.scala 
f2b027bf944e735fd52cc282690ec1b8395f9290 
  core/src/main/scala/kafka/server/KafkaServer.scala 
89200da30a04943f0b9befe84ab17e62b747c8c4 

Diff: https://reviews.apache.org/r/30482/diff/


Testing
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Thanks,

Guozhang Wang