bugfix: call queue.cfg() before box.cfg()

We don't have stable results if queue.cfg({in_replicaset = true})
is called after box.cfg(). Probably it is expected [1].

1. tarantool/queue#206

Part of #278

queue/example_connection_pool_test.go

@@ -61,6 +61,13 @@ func (h *QueueConnectionHandler) Discovered(conn *tarantool.Connection,
 
 	// Set up a queue module configuration for an instance.
 	q := queue.New(conn, h.name)
+
+	// Set up a queue module configuration for an instance. Ideally, this
+	// should be done before box.cfg({}) or you need to wait some time
+	// before start a work.
+	//
+	// See:
+	// https://github.com/tarantool/queue/issues/206
 	opts := queue.CfgOpts{InReplicaset: true, Ttr: 60 * time.Second}
 
 	if h.err = q.Cfg(opts); h.err != nil {

queue/testdata/pool.lua

@@ -25,6 +25,9 @@ end
 
 local queue = require('queue')
 rawset(_G, 'queue', queue)
+-- queue.cfg({in_replicaset = true}) should be called before box.cfg({})
+-- https://github.com/tarantool/queue/issues/206
+queue.cfg({in_replicaset = true, ttr = 60})
 
 local listen = os.getenv("TEST_TNT_LISTEN")
 box.cfg{