missing information in VTN user guide about coordinator

https://www.opendaylight.org/ -> User Guide -> vtn/vtn-user.adoc -> VTN_Overview.adoc
has a section about "VTN Coordinator". Is says it is an external application, but no clues about how to get it. The examples seem to assume that you have VTN coordinator installed.

I found this on the wiki:

https://wiki.opendaylight.org/view/OpenDaylight_Virtual_Tenant_Network_%28VTN%29:Installation:VTN_Coordinator
but it says:

cd vtn
git checkout release/helium-sr3

There is a remotes/origin/stable/lithium branch.