make --tls-remote compatible with pre 2.3 configs

make --tls-remote compatible with pre 2.3 configs

In openvpn 2.3.0 the semantics of the --tls-remote option changed.
That broke more configurations than anticipated. To not break
configurations that use --tls-remote with a legacy OpenSSL style DN
anymore, it is now detected when such a DN is configured. When
necessary the --compat-names option is then automatically enabled.

Signed-off-by: Heiko Hund <heiko.hund@sophos.com>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: 1361526263-1740-3-git-send-email-heiko.hund@sophos.com
URL: http://article.gmane.org/gmane.network.openvpn.devel/7366
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit ad532bba896875e56488e69ec16212a77787c57b)