management: Warn if TCP port is used without password

management: Warn if TCP port is used without password

It is not recommended to use --management on a TCP port without also
adding a password authentication, as this can easily be abused by other
users or processes being able to connect to the managmement interface.

Thus issue a warning that this configuration is strongly discouraged.

Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20180228131918.12954-3-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg16574.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 4db7715a3aa62f2e8d8234c1852fb141f62318e2)