Allow user to pre-select MFA device

[jfoy]

I keep an alternate MFA device on my account as a backup. As a result, I get prompted to select a particular device every time I log in:

MFA Required
Authenticate using one of these devices:
-----------------------------------------------------------------------
 0 | Google Authenticator
 1 | Yubico YubiKey
-----------------------------------------------------------------------

Select the desired MFA Device [0-1]:

I'd like to set a default choice through a command-line option or the properties file, to remove the manual step.

[pitbulk]

It seems reasonable.