finally rename policy to peer_list

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10447 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged changes from RC_1_0

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10448 a83610d8-ad2a-0410-a6ab-fc0612d85776