change the default UPnP settings to map anything that's found on the local network
change the default UPnP settings to map anything that's found on the local network

git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@2894 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

svn2github/libtorrent-trunk,svn2github/libtorrent-trunk,svn2github/libtorrent-trunk,svn2github/libtorrent-trunk