many lint fixes and optimizations (#17)

* util/kubernetes: drop stale files
* debug/log/kubernetes: drop stale files
* util/scope: remove stale files
* util/mdns: drop stale files
* lint fixes

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

selector/roundrobin/roundrobin_test.go

@@ -3,7 +3,6 @@ package roundrobin
 import (
 	"testing"
 
-	"github.com/stretchr/testify/assert"
 	"github.com/unistack-org/micro/v3/selector"
 )
 
@@ -19,18 +18,29 @@ func TestRoundRobin(t *testing.T) {
 	// By passing r1 and r2 first, it forces a set sequence of (r1 => r2 => r3 => r1)
 
 	next, err := sel.Select([]string{r1})
+	if err != nil {
+		t.Fatal(err)
+	}
 	r := next()
-	assert.Nil(t, err, "Error should be nil")
-	assert.Equal(t, r1, r, "Expected route to be r1")
+
+	if r1 != r {
+		t.Fatal("Expected route to be r == r1")
+	}
 
 	next, err = sel.Select([]string{r2})
+	if err != nil {
+		t.Fatal(err)
+	}
 	r = next()
-	assert.Nil(t, err, "Error should be nil")
-	assert.Equal(t, r2, r, "Expected route to be r2")
+	if r2 != r {
+		t.Fatal("Expected route to be r2")
+	}
 
 	routes := []string{r1, r2, r3}
 	next, err = sel.Select(routes)
-	assert.Nil(t, err, "Error should be nil")
+	if err != nil {
+		t.Fatal(err)
+	}
 	n1, n2, n3, n4 := next(), next(), next(), next()
 
 	// start element is random but then it should loop through in order
@@ -41,9 +51,19 @@ func TestRoundRobin(t *testing.T) {
 			break
 		}
 	}
-	assert.NotEqual(t, start, -1)
-	assert.Equal(t, routes[start], n1, "Unexpected route")
-	assert.Equal(t, routes[(start+1)%3], n2, "Unexpected route")
-	assert.Equal(t, routes[(start+2)%3], n3, "Unexpected route")
-	assert.Equal(t, routes[(start+3)%3], n4, "Unexpected route")
+	if start == -1 {
+		t.Fatalf("start == -1 %v %v", start, -1)
+	}
+	if routes[start] != n1 {
+		t.Fatal("Unexpected route")
+	}
+	if routes[(start+1)%3] != n2 {
+		t.Fatal("Unexpected route")
+	}
+	if routes[(start+2)%3] != n3 {
+		t.Fatal("Unexpected route")
+	}
+	if routes[(start+3)%3] != n4 {
+		t.Fatal("Unexpected route")
+	}
 }