pfPorts: Rename openvpn-ipv6 as openvpn22

Do similar what FreeBSD ports does with legacy ports, now with
3 version of OpenVPN and 2.3 supporting IPv6 without extra patch,
rename to 2.2.
pfPorts: Remove OpenVPN 2.2 IPv6 patches

Cosmetical change, but since 2.3 is out with integrated v6 support,
and no pfSense release shipping OpenVPN 2.2 has been IPv6 enabled,
we can remove the patches now
(in case 2.2.x will be sucked in let's say for security reasons)
Merge pull request #81 from matsimon/openvpn22-renaming

Openvpn22 renaming