Turn autocomplete off on ldap password form

app/views/ldap_auth_sources/_form.html.erb

@@ -76,10 +76,13 @@ See docs/COPYRIGHT.rdoc for more details.
   <fieldset class="form--fieldset">
     <legend class="form--fieldset-legend"><%= t(:label_details) %></legend>
     <div class="form--field"><%= f.text_field 'account', container_class: '-middle'  %></div>
-    <div class="form--field"><%= f.password_field 'account_password',
-              label: AuthSource.human_attribute_name(:password),
-              placeholder: ((@auth_source.new_record? || @auth_source.account_password.blank?) ? '' : ('●'*15)),
-              container_class: '-middle' %></div>
+    <div class="form--field">
+      <%= f.password_field 'account_password',
+                           label: AuthSource.human_attribute_name(:password),
+                           placeholder: ((@auth_source.new_record? || @auth_source.account_password.blank?) ? '' : ('●'*15)),
+                           autocomplete: 'off',
+                           container_class: '-middle' %>
+    </div>
     <div class="form--field"><%= f.text_field 'base_dn', size: 60, container_class: '-wide' %></div>
     <div class="form--field"><%= f.check_box 'onthefly_register', label: AuthSource.human_attribute_name(:onthefly) %></div>
   </fieldset>