ssh: must specify HostKeyCallback

[hectorqin]

I got this problem when i run this code on my macOS 10.12.3, but i have fixed it by editing the file of sshhelper.go

about line 214:

config := &ssh.ClientConfig{
	User: user,
	Auth: auths,
	HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error {
            return nil
        },
}

[kron4eg]

Yeah, this caused by recent changes in x/crypto/ssh. Getting the same.

[rotelok]

the fix works for me, was getting the exact same error

[mdevan]

Fixed in c49441b.