playbook/ors: run re6st without interface option in Lille office

playbook/roles/ors-upgrade/files/configure-re6st.sh

@@ -2,10 +2,14 @@
 IFACE="$(ip route | grep default | sed 's/.*dev \(\w*\)\( .*$\|$\)/\1/g')"
 CONF="/etc/re6stnet/re6stnet.conf"
 sed -i '/^interface/d' $CONF
-echo "interface $IFACE" >> $CONF
 # Don't run re6st with interface option at Lille Office
 if ping6 -q -c2 -w3 fe80::20d:b9ff:fe3f:9055%$IFACE; then
-  systemctl stop re6stnet;
-elif ! ps -ax -o cmd | grep babeld | grep -q $IFACE; then
+  if ps -ax -o cmd | grep babeld | grep -q $IFACE; then
     systemctl restart re6stnet;
+  fi
+else
+  echo "interface $IFACE" >> $CONF
+  if ! ps -ax -o cmd | grep babeld | grep -q $IFACE; then
+    systemctl restart re6stnet;
+  fi
 fi