Added support for TOTP password prompts, as used by google-authenticator-libpam #999
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TOTP prompts 'Verification code: ' as used by google-authenticator-libpam are now supported.
Reference: https://github.com/google/google-authenticator-libpam/blob/366ace3e5849d0d259915ddff22c8ec55e40b3ad/src/pam_google_authenticator.c#LL61C24-L61C42
Closes #998.