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/tests.go

@@ -2,8 +2,6 @@ package selector
 
 import (
 	"testing"
-
-	"github.com/stretchr/testify/assert"
 )
 
 // Tests runs all the tests against a selector to ensure the implementations are consistent
@@ -14,19 +12,27 @@ func Tests(t *testing.T, s Selector) {
 	t.Run("Select", func(t *testing.T) {
 		t.Run("NoRoutes", func(t *testing.T) {
 			_, err := s.Select([]string{})
-			assert.Equal(t, ErrNoneAvailable, err, "Expected error to be none available")
+			if err != ErrNoneAvailable {
+				t.Fatal("Expected error to be none available")
+			}
 		})
 
 		t.Run("OneRoute", func(t *testing.T) {
 			next, err := s.Select([]string{r1})
+			if err != nil {
+				t.Fatal("Error should be nil")
+			}
 			srv := next()
-			assert.Nil(t, err, "Error should be nil")
-			assert.Equal(t, r1, srv, "Expected the route to be returned")
+			if r1 != srv {
+				t.Fatal("Expected the route to be returned")
+			}
 		})
 
 		t.Run("MultipleRoutes", func(t *testing.T) {
 			next, err := s.Select([]string{r1, r2})
-			assert.Nil(t, err, "Error should be nil")
+			if err != nil {
+				t.Fatal("Error should be nil")
+			}
 			srv := next()
 			if srv != r1 && srv != r2 {
 				t.Errorf("Expected the route to be one of the inputs")
@@ -35,11 +41,14 @@ func Tests(t *testing.T, s Selector) {
 	})
 
 	t.Run("Record", func(t *testing.T) {
-		err := s.Record(r1, nil)
-		assert.Nil(t, err, "Expected the error to be nil")
+		if err := s.Record(r1, nil); err != nil {
+			t.Fatal("Expected the error to be nil")
+		}
 	})
 
 	t.Run("String", func(t *testing.T) {
-		assert.NotEmpty(t, s.String(), "String returned a blank string")
+		if s.String() == "" {
+			t.Fatal("String returned a blank string")
+		}
 	})
 }