reverts harcoded subclasses in ContainerManager
reverts harcoded subclasses in ContainerManager

the original intent was to remove Atomic from the dropdown
this is done by overriding #new in the controller
(transferred from ManageIQ/manageiq@5eb70765dba348062fbbebfa3a18fad25cd90c59)

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