KAFKA-1356 (Follow-up) patch to clean up metadata cache api; reviewed by Jun Rao
KAFKA-1356 (Follow-up) patch to clean up metadata cache api; reviewed by
Jun Rao

jhooda/kafka,jhooda/kafka,cloudera-labs/kafka,wyzssw/kafka,SinghAsDev/kafka,cloudera-labs/kafka,mthak/test_kafka,cloudera-labs/kafka,mthak/test_kafka,wyzssw/kafka,wyzssw/kafka,jhooda/kafka,mthak/test_kafka,SinghAsDev/kafka,jhooda/kafka,SinghAsDev/kafka