Logging level (#38)

* Set logging levels in Makefile using -DRAY_COMMON_LOG_LEVEL=level

* Lower level of some LOG_ERROR messages, log the name of the table operation on failure

* Address rest of Robert's comments

* Fix spurious log message

src/common/Makefile

@@ -38,6 +38,7 @@ redis:
 hiredis:
 	cd thirdparty/hiredis ; make
 
+test: CFLAGS += -DRAY_COMMON_LOG_LEVEL=4
 test: hiredis redis $(BUILD)/common_tests $(BUILD)/task_table_tests $(BUILD)/object_table_tests $(BUILD)/db_tests $(BUILD)/io_tests $(BUILD)/task_tests $(BUILD)/redis_tests FORCE
 	./thirdparty/redis-3.2.3/src/redis-server &
 	sleep 1s