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>

resolver/dns/dns_test.go

@@ -0,0 +1,14 @@
+package dns
+
+import "testing"
+
+func TestResolver(t *testing.T) {
+	r := &Resolver{}
+	recs, err := r.Resolve("unistack.org")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(recs) < 1 {
+		t.Fatalf("records not resolved: %v", recs)
+	}
+}