ssh key support (#12548)

Adding SSH key support

Adding ssh key support (with passphrases)

The JSch library does not support ED25519 keys, that are the default as
of OpenSSH 7.8, but the Apache Mina SSHD library does.

Adds a end-to-end test of ssh port forwarding via a simple echo server.

[ci drivers]

Co-authored-by: Franklin Strube <thedoc8786@gmail.com>
Co-authored-by: hbc <bcxxxxxx@gmail.com>
Co-authored-by: Daniel Higginbotham <daniel@flyingmachinestudios.com>
Co-authored-by: Paul Rosenzweig <paul.a.rosenzweig@gmail.com>
Co-authored-by: Kyle Doherty <kyle.l.doherty@gmail.com>