Revert "Update runc to 1.0.0"

vendor/github.com/opencontainers/runc/libcontainer/network_linux.go

@@ -83,7 +83,8 @@ func readSysfsNetworkStats(ethInterface, statsFile string) (uint64, error) {
 }
 
 // loopback is a network strategy that provides a basic loopback device
-type loopback struct{}
+type loopback struct {
+}
 
 func (l *loopback) create(n *network, nspid int) error {
 	return nil