TestSetMaxEstablishedConn does now work with utp

I think dialing out from a utp.Socket before its reader has initialized may be the cause. Either way moving the addPeers to after all the Clients are initialized has worked around it as a side effect.

client_test.go

@@ -953,7 +953,6 @@ func TestSetMaxEstablishedConn(t *testing.T) {
 	var tts []*Torrent
 	ih := testutil.GreetingMetaInfo().Info.Hash()
 	cfg := TestingConfig
-	cfg.DisableUTP = true
 	for i := range iter.N(3) {
 		cl, err := NewClient(&cfg)
 		require.NoError(t, err)