Add SSH askpass support

[oblivcheck]

If I use a public key with 2-step verification or only passwd,
will always fail verification:
Enter passwd for host:
Connection failed:......remote host has disconnected
Permission denied (publickey,passwd) OR Permission denied (publickey)

I can connect to the server via cli.
ssh Host/HostName
sshfs Host/HostName:path mountpoint
user@ip too.

And if i connect via just the public key there will be no problem.

[nosduco]

Thanks for the repo, and sorry you are having that issue! Candidly, the way I try to support passwords under the hood is a bit weird. Ideally, your ssh-agent allows you to connect without input but obviously that's not possible nor the best security practice in some instances. I want to see if there is some way I can incorporate keychains or some sort of SSH askpass. I'll whip something up and keep you updated here!