x_edit_buttons - support observe param to use observe queue for save/add buttons
x_edit_buttons - support observe param to use observe queue for save/add buttons

https://bugzilla.redhat.com/show_bug.cgi?id=1532201

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