Add node attr to XOTransport base (using defaults for now)
Add node attr to XOTransport base (using defaults for now)

crchemist/scioncc,crchemist/scioncc,crchemist/scioncc,scionrep/scioncc,mkl-/scioncc,scionrep/scioncc,mkl-/scioncc,scionrep/scioncc,mkl-/scioncc