remove session[:group] from tree_build (transferred from ManageIQ/manageiq@ec8c9af689e0fb715f5eb28fb49ba479819da53b)
remove session[:group] from tree_build
(transferred from ManageIQ/manageiq@ec8c9af689e0fb715f5eb28fb49ba479819da53b)

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