- Improve resilience in network & dns libs,

- Fix systemd scripts,
- Fix openvpn-up & openvpn-down scripts,
- Fix timing in vpn-admin_board.cgi script,
- Move systemd script from etc to usr.

www/cgi-bin/vpn-admin_board.cgi

@@ -663,10 +663,10 @@ vab_main_board_print()
         echo "    </P>"
 
              time_out=$(date +%s%N)
-                elaps=$(( TIME_IN - time_out ))
-            elaps_sec=$(( elaps / 1000000000 ))
-           elaps_mili=$(( ( elaps / 1000000) - ( elaps_sec * 1000) ))
-
+                elaps=$(( time_out - TIME_IN))
+            elaps_sec=$(( elaps / 1000000000))
+           elaps_mili=$(( ( elaps / 1000000) - ( elaps_sec * 1000)))
+            
         echo "    <P>"
         echo "      <BR>"
         echo "      <BR>"