network: do not destroy the team interface on teamd shutdown

when doing switch-root teamd gets killed, which tears down the team
interface, if teamd is not started with "-N".

modules.d/40network/ifup.sh

@@ -216,7 +216,7 @@ if [ -e /tmp/team.info ]; then
             fi
         done
         # Do not add slaves now
-        teamd -d -U -n -t $teammaster -f /etc/teamd/$teammaster.conf
+        teamd -d -U -n -N -t $teammaster -f /etc/teamd/$teammaster.conf
         for slave in $working_slaves; do
             # team requires the slaves to be down before joining team
             ip link set $slave down