Keep server state backup even on controlled shutdown

The server state information should be persisted even if a controlled
shutdown is done. This will allow the monitor to retain the server state
information across a restart.

server/modules/monitor/mysqlmon/mysql_mon.c

@@ -327,9 +327,6 @@ stopMonitor(MXS_MONITOR *mon)
 
     handle->shutdown = 1;
     thread_wait(handle->thread);
-
-    /** Controlled shutdown, remove stored backup */
-    remove_server_backup(mon);
 }
 
 /**

server/modules/monitor/mysqlmon/mysql_mon_backup.c

@@ -379,7 +379,7 @@ void load_server_backup(MXS_MONITOR *monitor)
                         if (process_data_file(monitor, data + MMB_LEN_SCHEMA_VERSION,
                                               data + size - MMB_LEN_CRC32))
                         {
-                            MXS_WARNING("Loaded persisted server states from backup file.");
+                            MXS_NOTICE("Loaded server states from backup file: %s", path);
                         }
                     }
                     else