Make --cipher/--auth none more explicit on the risks

Make --cipher/--auth none more explicit on the risks

The warning provided to --cipher and --auth using the 'none' setting may
not have been too clearly understandable to non-developers or people not
fully understanding encryption and cryptography.  This tries to improve
that.

While at it, also break up the long source lines.

Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <20170410222828.23612-1-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg14436.html
Signed-off-by: David Sommerseth <davids@openvpn.net>
(cherry picked from commit 7a1b6a0dd706a81897457b0456a951c0b30bbcfb)