tcpbridge: switch VR separator to --
tcpbridge: switch VR separator to --

Since I have - in the name of virtual roueters we can't use that to
separate the two routers, insted we use '--'.

mzagozen/vrnetlab,holmahenkel/vrnetlab,bdreisbach/vrnetlab,holmahenkel/vrnetlab,mzagozen/vrnetlab,bdreisbach/vrnetlab,plajjan/vrnetlab,plajjan/vrnetlab