fleetctl --tunnel with invalid IP times out and panics

[robszumski]

$ fleetctl --tunnel 10.10.10.10 list-units

panic: dial tcp 10.10.10.10:22: operation timed out

goroutine 1 [running]:
runtime.panic(0x2eab60, 0xc21000a780)
    /usr/local/go/src/pkg/runtime/panic.c:266 +0xb6
main.getRegistry(0xc210060ee0, 0xc210037820)
    /Users/robszumski/Documents/fleet/src/github.com/coreos/fleet/fleetctl/cmd.go:50 +0x1ab
main.listUnitsAction(0xc210060ee0)
    /Users/robszumski/Documents/fleet/src/github.com/coreos/fleet/fleetctl/list_units.go:32 +0x35
github.com/coreos/fleet/third_party/github.com/codegangsta/cli.Command.Run(0x34d7b0, 0xa, 0x0, 0x0, 0x386e70, ...)
    /Users/robszumski/Documents/fleet/src/github.com/coreos/fleet/third_party/github.com/codegangsta/cli/command.go:73 +0x994
github.com/coreos/fleet/third_party/github.com/codegangsta/cli.(*App).Run(0xc21007b000, 0xc21000a000, 0x4, 0x4, 0x7, ...)
    /Users/robszumski/Documents/fleet/src/github.com/coreos/fleet/third_party/github.com/codegangsta/cli/app.go:111 +0x855
main.main()
    /Users/robszumski/Documents/fleet/src/github.com/coreos/fleet/fleetctl/cmd.go:97 +0x9ae

goroutine 3 [chan receive]:
github.com/coreos/fleet/third_party/github.com/golang/glog.(*loggingT).flushDaemon(0x6e7000)
    /Users/robszumski/Documents/fleet/src/github.com/coreos/fleet/third_party/github.com/golang/glog/glog.go:839 +0x50
created by github.com/coreos/fleet/third_party/github.com/golang/glog.init·1
    /Users/robszumski/Documents/fleet/src/github.com/coreos/fleet/third_party/github.com/golang/glog/glog.go:406 +0x276

goroutine 4 [syscall]:
runtime.goexit()
    /usr/local/go/src/pkg/runtime/proc.c:1394