* modules/openstack_project/files/cacti/create_graphs.sh: At some
point, the default tree ceased being named "Default Tree" and became
"All Hosts" at which point new host nodes were no longer able to be
added to it. Correcting here should improve the situation for future
additions.
Change-Id: I4869a1d470497b120dd99c97677a7ae4dc26667f