[BUG] doveadm / mail-crypt: Error when setting new password for a user key

[Kevin N.]

Dovecot version: 2.3.14

When setting a new password for a user key you have the option to prompt
the user for the old and the new password, instead of providing them as 
parameters (using -N and -O instead of -n and -o).

However, running:
	doveadm mailbox cryptokey password -u user at domain -N -O

produces an error instead of prompting the user for the old and the new 
password.

The error is:
	password: option requires an argument -- 'O'


You can work around this by providing a dummy input for -O which seems 
to be properly ignored in the end, but it would be nice to not throw any 
errors since -O should not expect an argument.

Regards.