openconnect: set config variable on teardown and correctly pass the password

This addresses https://dev.openwrt.org/ticket/16634

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

net/openconnect/files/openconnect-wrapper

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# This script wraps openconnect in order to obtain the password
+# file from cmd.
+
+# $1 password file
+# $2... are passed to openconnect
+
+test -z "$1" && exit 1
+
+pwfile=$1
+shift
+
+cat $pwfile|/usr/sbin/openconnect $*