UI - make engine list more consistent with the auth method list (#4598)

* remove expanding behavior from engines list and add a configuration route

* use page header component, secret tab component for the template on the secret engine configuration route

* move abstraction to secret-list-header and remove secret-tabs

* add attrs to secret engine model and adjust mount controller code to support that

* fix top level nav so that we can use the back button properly

* fix tests

ui/app/models/secret-engine.js

@@ -3,6 +3,8 @@ import DS from 'ember-data';
 import { queryRecord } from 'ember-computed-query';
 import { fragment } from 'ember-data-model-fragments/attributes';
 
+import { expandAttributeMeta } from 'vault/utils/field-to-attrs';
+
 const { attr } = DS;
 const { computed } = Ember;
 
@@ -16,11 +18,26 @@ export default DS.Model.extend({
   name: attr('string'),
   type: attr('string'),
   description: attr('string'),
-  config: attr('object'),
-  options: fragment('mount-options'),
+  config: fragment('mount-config', { defaultValue: {} }),
+  options: fragment('mount-options', { defaultValue: {} }),
   local: attr('boolean'),
   sealWrap: attr('boolean'),
 
+  formFields: [
+    'type',
+    'path',
+    'description',
+    'accessor',
+    'local',
+    'sealWrap',
+    'config.{defaultLeaseTtl,maxLeaseTtl}',
+    'options.{version}',
+  ],
+
+  attrs: computed('formFields', function() {
+    return expandAttributeMeta(this, this.get('formFields'));
+  }),
+
   shouldIncludeInList: computed('type', function() {
     return !LIST_EXCLUDED_BACKENDS.includes(this.get('type'));
   }),