Container node: add dialog_load and related routes.
Container node: add dialog_load and related routes.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1535409

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic