Fix loading hang

Import and add loading property to pages that are disabling
forms based on LoadingBarMixin loading property.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I1669bff2572422327566a3afe023633eb0b729f4
diff --git a/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue b/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
index d3c19d5..6e8c967 100644
--- a/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
+++ b/src/views/Configuration/DateTimeSettings/DateTimeSettings.vue
@@ -210,7 +210,9 @@
 
 import BVToastMixin from '@/components/Mixins/BVToastMixin';
 import LoadingBarMixin from '@/components/Mixins/LoadingBarMixin';
-import LocalTimezoneLabelMixin from '@/components/Mixins/LocalTimezoneLabelMixin';
+import LocalTimezoneLabelMixin, {
+  loading,
+} from '@/components/Mixins/LocalTimezoneLabelMixin';
 import VuelidateMixin from '@/components/Mixins/VuelidateMixin.js';
 
 import { mapState } from 'vuex';
@@ -243,6 +245,7 @@
         },
         ntp: { firstAddress: '', secondAddress: '', thirdAddress: '' },
       },
+      loading,
     };
   },
   validations() {