Remove json related modules

Add options to script module
Fix basic_stream_tests

- Replace json-field-value-extractor processor with splitter that uses
XD-1378: Add metadata to Splunk module
Merge branch 'master' into zk-runtime
Fixed AbstractSingleNodeInitializationTests
Fixed invalid map references
WIP
Added embeddedZooKeeper.start() in setup
Fixed ZooKeeperClientConnectionTests. Make RetryPolicy Pluggable
Fixed ZooKeeperClientConnectionTests. Make RetryPolicy Pluggable(2)
 Merged fix to listeners in SingleNodeIntegrationTestSupport.java