Fix hard coded dependency on node with id 0 in AdminClient
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
Change output dir to output file for ZoneClipper