* feat(throughput): single process per queue
* fix data race
* fix: golint and data race on load test
* wrap up initial v2 scheduler
* fix: more debug logs and tighten channel logic/blocking sends
* improved casing on dispatcher and lease manager
* fix: data race on min id
* increase wait on load test, fix data race
* fix: trylock -> lock
* clean up queue when no longer in set
* fix: clean up cache on exit
* ensure cleanup is only called once
* address review comments