Fix a logic problem in handling of --up scripts in t_client.sh

Fix a logic problem in handling of --up scripts in t_client.sh

Previously the $up variable was never reset after being set. This mean that
"--up update_t_client_ips.sh" was appended to all subsequent openvpn
command-lines, even if cached IPs existed.

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1478695325-18038-1-git-send-email-samuli@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg12979.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>