Unbreak read username password from management

Unbreak read username password from management

Commit 6e9373c846.. introduced a bug by which auth-user-pass
or need-ok input falls back to read-from-stdin after successfully
reading from management or console. Fix by treating stdin as the last
option for input.

Signed-off-by: Selva Nair <selva.nair@gmail.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1448590853-26862-1-git-send-email-selva.nair@gmail.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/10630
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit cdd69bb7f1c207fb5a9648f36440d7c6e2dcaa76)