Notas
- SSH client escape sequences
- https://lonesysadmin.net/2011/11/08/ssh-escape-sequences-aka-kill-dead-ssh-sessions/
- connection multiplexing
- http://man.openbsd.org/ssh_config
- https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Multiplexing#Setting_Up_Multiplexing
- http://blog.scottlowe.org/2015/12/11/using-ssh-multiplexing/
- authorized_keys
- http://man.openbsd.org/OpenBSD-current/man8/sshd.8
- http://gitolite.com/gitolite/glssh.html#how-does-gitolite-use-all-this-ssh-magic
- SSH Tunnels
- http://blog.trackets.com/2014/05/17/ssh-tunnel-local-and-remote-port-forwarding-explained-with-examples.html
- http://unix.stackexchange.com/questions/46235/how-does-reverse-ssh-tunneling-work
- sshuttle
- http://sshuttle.readthedocs.io/en/stable/
- https://github.com/sshuttle/sshuttle.git