fix regression: query password before becoming daemon

fix regression: query password before becoming daemon

The init sequence was changed to daemonize before the crypto init to fix
issues on FreeBSD some commits ago.  This introduced a regression where
we would no longer query for passwords before daemonizing, as described
in trac #574 and #576.

This commit restores the correct order, and adds a bit of const
correctness since we're touching this now code anyway.

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1436477759-5884-1-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9901
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 315f6fbc7f657a7f1127628bd714f468709d5185)