Revert "connect gearpump with Kafka"

This reverts commit 37a835677575e1548e98e25013de9ec8a86be2ac.
Merge remote-tracking branch 'remotes/upstream/master'
Merge remote-tracking branch 'remotes/upstream/master'

Conflicts:
	core/src/main/resources/shell.scala
	examples/src/main/scala/org/apache/gearpump/streaming/examples/kafka/KafkaSpout.scala
change resource on worker to be configurable
add kafka conf file
remote zombie codes
Merge pull request #66 from huafengw/workerResource

change resource on worker to be configurable
Merge pull request #67 from manuzhang/add_kafka_conf_file

Add kafka conf file