pfSense/pfsense 3bfecc8src/etc/inc openvpn.inc, src/usr/local/www vpn_openvpn_server.php vpn_openvpn_client.php

Fix #3743: Allow OpenVPN keepalive configuration

- Remove hardcoded 'keepalive 10 60' configuration
- Added 'inactive seconds' option
- Let user configure 'keepalive interval timeout'. It defaults to 10 60
  as it was hardcoded until now
- Let user define ping and chose between ping-exit or ping-restart
- In server mode let user decide to push or not
  ping/ping-exit/ping-restart to client
DeltaFile
+128-0src/usr/local/www/vpn_openvpn_server.php
+106-0src/usr/local/www/vpn_openvpn_client.php
+46-1src/etc/inc/openvpn.inc
+280-13 files

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