bundles/wireguard: less spammy output for wg_health_check

bundles/wireguard/files/wg_health_check

@@ -13,8 +13,9 @@ everything_up=1
 
 % for peer, ip in sorted(peers.items()):
 # ${peer}
-if ! /usr/bin/ping -c 4 ${ip}
+if ! /usr/bin/ping -c 4 ${ip} >/dev/null
 then
+    echo "${peer} was not reachable!" >&2
     everything_up=0
 fi
 
@@ -31,7 +32,7 @@ last_reached="$(cat /var/tmp/wg_all_reached)"
 
 if [[ "$last_reached" -lt "$five_min_ago" ]]
 then
-    echo "RESTART"
+    echo "RESTART" >&2
 
     systemctl restart systemd-networkd