* Add RAY.CONNECT Redis command.
* Add RAY.GET_CLIENT_ADDRESS command.
* Build and clean Redis in common Makefile.
* Use custom Redis module in Ray and use custom CONNECT and GET_CLIENT_ADDRESS commands.
* Fixes.
* Remove mapping from redis client ID to ray db client ID.
* Fix.
* passing plasma ip:port association with photon through redis to global scheduler
* Fix test.
* sanity-checking aux_address inside db_connect_extended
* clang format
* fix photon tests
* clang format photon tests
* Initial scheduler commit
* global scheduler
* add global scheduler
* Implement global scheduler skeleton.
* Formatting.
* Allow local scheduler to be started without a connection to redis so that we can test it without a global scheduler.
* Fail if there are no local schedulers when the global scheduler receives a task.
* Initialize uninitialized value and formatting fix.
* Generalize local scheduler table to db client table.
* Remove code duplication in local scheduler and add flag for whether a task came from the global scheduler or not.
* Queue task specs in the local scheduler instead of tasks.
* Simple global scheduler tests, including valgrind.
* Factor out functions for starting processes.
* Fixes.
