Description of problem:
If a child host group attribute is not currently inherit from the parent host group. The selection option will show the incorrect "inherit parent" value.


Steps to Reproduce:
1. In web ui, Create a parent host group and set the "Deploy On" to a compute resource. For example, "Brisbane Vcenter"
2. In web ui, Create a child host group and set the "Deploy On" to a different compute resource. For example, "Sydney Vcenter".
3. After creating the child host group. Edit the child host group, click the "Deploy on" select box

Actual results:
It is showing "Inherit parent (Sydney Vcenter)".

Expected results:
It should be showing "Inherit parent (Brisbane Vcenter)

Additional info:

Make the following change seems to fix the issue

--- a/helpers/form_helper.rb	2021-09-09 16:22:49.684921775 +1000
+++ b/helpers/form_helper.rb	2021-09-09 16:23:05.679076650 +1000
@@ -345,7 +345,7 @@
 
   def blank_or_inherit_f(f, attr, blank_value: _("no value"))
     return true unless f.object.respond_to?(:parent_id) && f.object.parent_id
-    inherited_value   = f.object.send(attr)
+    inherited_value   = f.object.respond_to?(:nested) ? f.object.nested(attr) : f.object.send(attr)
     inherited_value   = inherited_value.name_method if inherited_value.present? && inherited_value.respond_to?(:name_method)
     inherited_value ||= blank_value
     _("Inherit parent (%s)") % inherited_value