Knife bootstrap password prompt can't be exited from

[tas50]

It appears we're rescuing too agressively here somewhere. If you bootstrap a node you cant ctl-c out of the boostrap password prompt:

WARNING: Failed to authenticate  to ec2-54-187-152-162.us-west-2.compute.amazonaws.com - trying password auth
Enter password for @ec2-54-187-152-162.us-west-2.compute.amazonaws.com:

[kvivek1115]

It's due to highline gem known issue JEG2/highline/issues/236, an alternative to this we can use
IO.html#method-i-getpass

[tas50]

I'd love to get off highline. We've pretty universally adopted the gems in the TTY project, which are actively maintained and have nice interfaces: https://ttytoolkit.org/