Fix usage of 'compression ...' from global config.

Fix usage of 'compression ...' from global config.

The new compression framework introduced by SVN r8206 only works for
a P2MP server if the compression settings are re-installed for each
client via management interface, ccd/ file or client-connect script,
but the "global" settings get lost due to (needlessly) clearing the
c2.comp_context in the per-client instance.  Fixed.  (also trac#273)

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <1366393268-27392-6-git-send-email-gert@greenie.muc.de>
URL: http://article.gmane.org/gmane.network.openvpn.devel/7529