Refs #22285 - disable cr fields on hosts form

These fields are only used to determine in JS what capabilities the
current compute resource allows, they don't need to be sent to the
server.

app/views/hosts/_compute.html.erb

@@ -17,7 +17,7 @@
                 :text => _("Errors: %s") % compute_resource.errors.full_messages.to_sentence) %>
     <% end %>
   <% end%>
-  <%= hidden_field_tag 'capabilities', compute_resource.capabilities %>
-  <%= hidden_field_tag 'provider', compute_resource.provider %>
+  <%= hidden_field_tag 'capabilities', compute_resource.capabilities, :disabled => true %>
+  <%= hidden_field_tag 'provider', compute_resource.provider, :disabled => true %>
   <%= content_tag(:div,'', :id => :'supports_update', :data=>{:'supports-update'=> compute_resource.supports_update? || (@host && @host.new_record?)}) %>
 <% end if compute_resource %>