Misleading password prompt when running "magi deploy"

[Haprog]

If you haven't yet provided bender credentials to magi (e.g. first time running magi deploy) it will ask for the credentials in the following way:

Please provide your bender.vaadin.com authentication credentials
Username: <username_typed_by_you>
Password: <password_typed_by_you>
<password_typed_by_you>

It works, but after typing your password for the first time it just goes to the next line with no additional prompt so you may be wondering why isn't it working but you actually just need to type your password again.

After typing your password for the first time it should probably say something like "Confirm password: " so the user realizes it needs to be typed in again.

Related to #87

[Haprog]

This might apply also for magi deploy --auth