improve DHT logging a bit

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10346 a83610d8-ad2a-0410-a6ab-fc0612d85776
remove pointless DHT extension (for IPv6)

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10347 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix uninitialized values in DHT DOS mitigation

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10348 a83610d8-ad2a-0410-a6ab-fc0612d85776
merge fix from RC_0_16

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10349 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged changes from RC_1_0

git-svn-id: svn://svn.code.sf.net/p/libtorrent/code@10350 a83610d8-ad2a-0410-a6ab-fc0612d85776