VmCommon: do not set @button_group, toolbars no longer contain vmtree and snapshot groups.
VmCommon: do not set @button_group, toolbars no longer contain vmtree and snapshot groups.

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