Moves the default KeystoneAdminApiNetwork setting to the ctlplane
so that the undercloud will always have easy access to be able
to configure endpoints.
Change-Id: I1f6aba62b98820b678cce1ca16e72a0c3d045720
       CinderIscsiNetwork: storage
       GlanceApiNetwork: storage
       GlanceRegistryNetwork: internal_api
-      KeystoneAdminApiNetwork: internal_api
+      KeystoneAdminApiNetwork: ctlplane # allows undercloud to config endpoints
       KeystonePublicApiNetwork: internal_api
       NeutronApiNetwork: internal_api
       HeatApiNetwork: internal_api