If --tls-cipher is supplied, make --show-tls parse the list.

This allows to check the available TLS ciphers for a specific configuration
by supplying both --tls-cipher and --show-tls options.

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1388607026-12297-4-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8150
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit cb03dca83e37fd65666bf776f39da902fb10acbc)