Fix issue around adding incorrect KnownHost

[epinault]

Host should always be check against remote as it could be a name or an IP. but if the name is passed then it won t match the remote IP and therefore saved the incorrect entry in the known host

[melbahja]

Hi,

thanks for the PR.

I think it will be batter if we could store them both:

remoteNormalized := knownhosts.Normalize(remote.String())
hostNormalized := knownhosts.Normalize(host)
addresses := []string{remoteNormalized}

if hostNormalized != remoteNormalized {
	addresses = append(addresses, hostNormalized)
}

_, err = f.WriteString(knownhosts.Line(addresses, key) + "\n")

[melbahja]

Thanks :)