Warn if tls-version-max < tls-version-min

Warn if tls-version-max < tls-version-min

This adds warnings for when a user or our code tries to set a maximum
TLS version that's smaller then the current configured minimum TLS
version.

(And fixes some related whitespace now I touch it anyway.)

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Selva Nair <selva.nair@gmail.com>
Message-Id: <20180224170449.25194-1-steffan@karger.me>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg16545.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit f8a92a4393aae32fc44e03241b5cc891ca6e58a4)