[#1648] morph: Change endpoint priority order

The lowest value means the highest priority.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/morph/client/multy_test.go

@@ -0,0 +1,29 @@
+package client
+
+import (
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestInitEndpoints(t *testing.T) {
+	rand.Seed(time.Now().UnixNano())
+
+	ee := make([]Endpoint, 100)
+	for i := range ee {
+		ee[i].Priority = rand.Int()
+	}
+
+	var eeInternal endpoints
+	eeInternal.init(ee)
+
+	prevValue := eeInternal.list[0].Priority
+
+	for _, e := range eeInternal.list {
+		require.True(t, prevValue <= e.Priority)
+
+		prevValue = e.Priority
+	}
+}