[fix] Let VPN mount

conf/ynh-vpnclient

@@ -129,6 +129,10 @@ start_openvpn() {
     [ "${ynh_server_proto}" == tcp ] && proto=tcp-client
   fi
 
+  # Unset firewall to let DNS and NTP resolution works
+  # Firewall is reset after vpn is mounted (more details on #1016)
+  unset_firewall
+  
   sync_time
 
   cp /etc/openvpn/client.conf{.tpl,}
@@ -200,20 +204,6 @@ stop_openvpn() {
 sync_time() {
   systemctl stop ntp
   timeout 20 ntpd -qg &> /dev/null
-  
-  # Some networks drop ntp port (udp 123). 
-  # Try to get the date with an http request on the internetcube web site
-  if [ $? -ne 0 ]; then
-    http_date=`curl -sD - labriqueinter.net | grep '^Date:' | cut -d' ' -f3-6`
-    http_date_seconds=`date -d "${http_date}" +%s`
-    curr_date_seconds=`date +%s`
-
-    # Set the new date if it's greater than the current date
-    # So it does if 1970 year or if old fake-hwclock date is used
-    if [ $http_date_seconds -ge $curr_date_seconds ]; then
-      date -s "${http_date}"
-    fi
-  fi 
   systemctl start ntp
 }