should have an openssh backend #563
Description
sshkit currently depends on 'net-ssh' for connecting to remote hosts. net-ssh is reimplementing ssh in pure ruby, and failing as badly as as one would expect on the security front: It still supports cryptography that's obsolete and broken, it does not implement current algorithms (in particular no post-quantum ones), it does not support private keys on hardware tokens, it does not check hostkeys by default, and probably lots more...
Therefore, sshkit should be able to call out to the "ssh" binary and thus leave the crypto to the professionals.