nsqlookupd: less flaky protocol test

NSQLookupd.New() listens on TCPAddress and HTTPAddress, which
NewOptions() gives default values of 4160 and 4161,
and sometimes this conflicts with other tests running concurrently.

nsqlookupd/lookup_protocol_v1_test.go

@@ -35,6 +35,8 @@ func testIOLoopReturnsClientErr(t *testing.T, fakeConn test.FakeNetConn) {
 	opts := NewOptions()
 	opts.Logger = test.NewTestLogger(t)
 	opts.LogLevel = LOG_DEBUG
+	opts.TCPAddress = "127.0.0.1:0"
+	opts.HTTPAddress = "127.0.0.1:0"
 
 	nsqlookupd, err := New(opts)
 	test.Nil(t, err)