[Dovecot] nologin in auth proto version 1.1

[Kirill Miazine]

I notice that the nologin parameter for the AUTH command is gone in
version 1.1 of Dovecot Authentication Protocol.

nologin was added in 1.1, so that authentication client could indicate
that there will be no subsequent master requests to retrieve user info.

Could we have nologin back please?

Kirill