CONFIG GET syslog-facility added.

Was missing for some reason. Trivial to add after config.c refactoring.

src/config.c

@@ -1123,6 +1123,8 @@ void configGetCommand(redisClient *c) {
             server.supervised_mode,supervised_mode_enum);
     config_get_enum_field("appendfsync",
             server.aof_fsync,aof_fsync_enum);
+    config_get_enum_field("syslog-facility",
+            server.syslog_facility,syslog_facility_enum);
 
     /* Everything we can't handle with macros follows. */