fix log4j properties problem for voldemort-server.sh
bash script fixes on path
Auto purge dead slops
Hardening test for auto purging dead slops
added unset_zone_id context for clients
Cleanup metadata directory after test in StorageServiceTest
Initialize clientZoneId with unset_zone_id in ClientConfig
Use own node id during server startup + ZonedRebalanceNonContiguousZonesTest
Add tool (ZoneClipperCLI) to drop zone + shell script
Enable server side routing for tests that depend on it
Minor renaming and comment improvment
Add unit test for ZoneClipperCLI