gluon-config-mode: don't let UCI_CONFIG_DIR leak to the telnet environment etc.

package/gluon-config-mode/files/etc/init.d/gluon-config-mode

@@ -24,6 +24,7 @@ check_enable() {
 }
 
 setup_network() {
+	(
 		export UCI_CONFIG_DIR=/var/gluon/config-mode/config
 
 		mkdir -p "$UCI_CONFIG_DIR"
@@ -42,7 +43,6 @@ setup_network() {
 
 		uci_commit network
 
-
 		SERVICE_DAEMONIZE=1
 		SERVICE_WRITE_PID=1
 		service_start /sbin/netifd -c "$UCI_CONFIG_DIR"
@@ -51,6 +51,7 @@ setup_network() {
 
 		include /lib/network
 		setup_switch
+	)
 }
 
 start() {