Support UTF-8 --client-config-dir

Support UTF-8 --client-config-dir

If a common name (or user name, when used in conjunction with
--username-as-common-name) contains UTF-8 encoded characters their
octets get replaced by underscores. This becomes problematic when
user "Müller" and "Möller" need to have a CCD file and both would
receive options from the file "M__ller". The situation is even
worse for non-latin alphabets, where CCD file names consist of
underscores entirely.

This patch removes that limitation and also allows the file names
to contain any punctuation characters besided the resevered ones.

Signed-off-by: Heiko Hund <heiko.hund@sophos.com>
Acked-by: David Sommerseth <davids@redhat.com>
Message-Id: 1351516597-11128-1-git-send-email-heiko.hund@sophos.com
URL: http://article.gmane.org/gmane.network.openvpn.devel/7110
Signed-off-by: David Sommerseth <davids@redhat.com>