In order for us to transition python-openstackclient to keystoneauth,
we need a path forward so that people can move from using the in-tree
token-endpoint plugin to just using the admin-token plugin (which is the
thing that should be used for the bootstrapping-keystone usecase)
We could do fancy things in OCC to accomplish this (I have a patch) -
but instead of doing that, which is, as Dean says, really a layer
violation, why don't we just put url in here and be done with it.
Change-Id: Ia240d9599aad0c3e6727fcde451e3ddd21bc242f
67280cbb01