def addrconfig(self, addrlist):
        if self.gretap:
            raise ValueError, "gretap already exists for %s" % self.name
        remoteip = addrlist[0].split('/')[0]
        localip = None
        if len(addrlist) > 1:
            localip = addrlist[1].split('/')[0]
        self.gretap = GreTap(session = self.session, remoteip = remoteip,
                             objid = None, name = None,
                             localip = localip, ttl = self.ttl, key = self.grekey)
        self.attach(self.gretap)
Set the remote tunnel endpoint. This is a one-time method for 
dataset/ETHPy150Open coreemu/core/daemon/core/netns/vnet.py/GreTapBridge.addrconfig