Do not copy host securetty file - this one should be comprehensive
or bind mount host one in yourself.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
Warn the user in the MOTD
Add "(ns: getty)" or "(ns: sshd)" to the PS1
Use `agetty` and `-a root` to ensure we get a login shell when insecure
Signed-off-by: Dave Tucker <dt@docker.com>