use the minimum of the last 3 delay measurement for the congestion controller
use the minimum of the last 3 delay measurement for the congestion controller

git-svn-id: 4b20f32ac28c752316e0f948a8a743f4a1700c23@4588 a83610d8-ad2a-0410-a6ab-fc0612d85776

cscheid/libtorrent,cit/libtorrent-peer-idol,cit/libtorrent-peer-idol,cscheid/libtorrent,cit/libtorrent-peer-idol,cit/libtorrent-peer-idol,kuro/libtorrent,kuro/libtorrent,cscheid/libtorrent,cscheid/libtorrent,kuro/libtorrent,cit/libtorrent-peer-idol,cscheid/libtorrent,cit/libtorrent-peer-idol,cscheid/libtorrent,kuro/libtorrent