Open Stack

I've been looking at how the 3 nova_proxy_admin_* settings are used. I'm 
coming to the conclusion that I'm confused:

E.g I note that a standard devstack (stable/juno branch) with trove 
enabled sets these as follows:

nova_proxy_admin_pass =
nova_proxy_admin_tenant_name = trove
nova_proxy_admin_user = radmin


However there is no 'radmin' user (or role) created in keystone, so the 
settings above cannot possibly work (if they were needed/used). Some 
experimentation involving removing these three settings from all of the 
trove config files seems to support the idea that they are in fact not 
needed, which has me somewhat puzzled.

If someone could shed some light here that would be awesome!

Thanks

Mark