improve logging and use yunohost service restart instead of systemctl restart

conf/ynh-vpnclient

@@ -148,6 +148,8 @@ case "$action" in
   # ########## #
 
   start)
+    info "[vpnclient] Starting..."
+    
     if [[ -e /tmp/.ynh-vpnclient.started ]] || systemctl -q is-active openvpn@client.service; then
       info "Service is already running"
       exit 0

conf/ynh-vpnclient-checker.sh

@@ -1,7 +1,9 @@
 #!/bin/bash
 
-if [[ ! -e /tmp/.ynh-vpnclient-started ]] && ! ip route get 1.2.3.4 | grep -q tun0; then
-  systemctl restart ynh-vpnclient &> /dev/null
+if [[ -e /tmp/.ynh-vpnclient-started ]] || ip route get 1.2.3.4 | grep -q tun0; then
+  echo "[INFO] Service is already running"
+  exit 0
+else
+  echo "[INFO] Restarting VPN client service"
+  yunohost service restart ynh-vpnclient &> /dev/null
 fi
-
-exit 0