move locally persisted state to SpawnState

- queryHost, spawnHost, debug, and queryPort are no longer
  written locally
- uuid, quiesce, and disabledHosts are now stored in SpawnState
- uuid, quiesce, and disabledHosts are now thread-safe
migrate spawn host/port configs
handle jetty closure in close rather than new hook
migrate spawn directory configs + misc. org.
migrate spawn executor services to codec
merge spawn constructors
migrate jobStore config to codec
fix zkClient optional injectable namespacing