Greatly simplify etorrent_peer_mgr code.
Greatly simplify etorrent_peer_mgr code.

Inline spawn_new_peer into fill_peers. The change simplifies the code
and also eradicates a small bug: If the peer table becomes full, we
loose the peer we were just about to spawn since the fill_peers
function removed it.

beni55/etorrent,jlouis/etorrent