improve reliability of test_privacy

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9784 a83610d8-ad2a-0410-a6ab-fc0612d85776
improve test_tracker robustness

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9785 a83610d8-ad2a-0410-a6ab-fc0612d85776
report progress as 1.0 and every byte downloaded when in seed mode

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9786 a83610d8-ad2a-0410-a6ab-fc0612d85776