fix race condition caused by sharing udp socket and opening it in the session thread. Moved initialization to session constructor
fix race condition caused by sharing udp socket and opening it in the session thread. Moved initialization to session constructor

git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@4551 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent