openvpn: fix handling option auth_retry.

As reported in ticket #19104, auth_retry takes a <type> argument with 3
choices: none, nointeract, interact.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

SVN-Revision: 45960

package/network/services/openvpn/files/openvpn.init

@@ -94,7 +94,7 @@ start_instance() {
 
 	# append flags
 	append_bools "$s" \
-		auth_nocache auth_retry auth_user_pass_optional bind ccd_exclusive client client_cert_not_required \
+		auth_nocache auth_user_pass_optional bind ccd_exclusive client client_cert_not_required \
 		client_to_client comp_noadapt disable \
 		disable_occ down_pre duplicate_cn fast_io float http_proxy_retry \
 		ifconfig_noexec ifconfig_nowarn ifconfig_pool_linear management_forget_disconnect management_hold \
@@ -107,7 +107,7 @@ start_instance() {
 
 	# append params
 	append_params "$s" \
-		cd askpass auth auth_user_pass auth_user_pass_verify bcast_buffers ca cert \
+		cd askpass auth auth_retry auth_user_pass auth_user_pass_verify bcast_buffers ca cert \
 		chroot cipher client_config_dir client_connect client_disconnect comp_lzo connect_freq \
 		connect_retry connect_timeout connect_retry_max crl_verify dev dev_node dev_type dh \
 		echo engine explicit_exit_notify fragment group hand_window hash_size \