fix dht unit test

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9747 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix bug in patch to introduce file_priority disk job

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9748 a83610d8-ad2a-0410-a6ab-fc0612d85776