Add 'Restricted Start' config setting.

plugins/dynamix/DiskSettings.page

@@ -64,6 +64,15 @@ Enable auto start:
 > the array will be automatically Started and shares exported.<br>
 > If set to 'No' then you must Start the array yourself.
 
+Restricted Start:
+: <select name="luksRestricted" size="1">
+  <?=mk_option($var['luksRestricted'], "yes", "Yes")?>
+  <?=mk_option($var['luksRestricted'], "no", "No")?>
+  </select>
+
+> When set to **Yes** the array cannot Start if there are encrypted devices and the encryption passphrase/keyfile
+> is *missing*.
+
 Default spin down delay:
 : <select name="spindownDelay" size="1">
   <?=mk_option($var['spindownDelay'], "0",  "Never")?>