Update worker.py and services.py to use plasma and the local scheduler. (#19)

* Update worker code and services code to use plasma and the local scheduler.

* Cleanups.

* Fix bug in which threads were started before the worker mode was set. This caused remote functions to be defined on workers before the worker knew it was in WORKER_MODE.

* Fix bug in install-dependencies.sh.

* Lengthen timeout in failure_test.py.

* Cleanups.

* Cleanup services.start_ray_local.

* Clean up random name generation.

* Cleanups.

src/photon/photon_algorithm.c

@@ -169,7 +169,7 @@ void handle_worker_available(scheduler_info *info,
     /* Add client_sock to a list of available workers. This struct will be freed
      * when a task is assigned to this worker. */
     utarray_push_back(state->available_workers, &worker_index);
-    LOG_INFO("Adding worker_index %d to available workers.\n", worker_index);
+    LOG_DEBUG("Adding worker_index %d to available workers.\n", worker_index);
   }
 }
 

src/photon/photon_scheduler.c

@@ -148,7 +148,7 @@ void new_client_connection(event_loop *loop, int listener_sock, void *context,
   local_scheduler_state *s = context;
   int new_socket = accept_client(listener_sock);
   event_loop_add_file(loop, new_socket, EVENT_LOOP_READ, process_message, s);
-  LOG_INFO("new connection with fd %d", new_socket);
+  LOG_DEBUG("new connection with fd %d", new_socket);
   /* Add worker to list of workers. */
   /* TODO(pcm): Where shall we free this? */
   worker_index *new_worker_index = malloc(sizeof(worker_index));