set sensable defaults for storage deamon

bareos-sd.d/lto7.conf

@@ -9,6 +9,8 @@ Device {
   AlwaysOpen = yes;
   RemovableMedia = yes;
   RandomAccess = no;
-  Maximum File Size = 50GB
+  #Maximum File Size = 50GB;
+  AutomaticMount = yes;
+  LabelMedia = yes;
 }