Add go fuzzer in preparation for testing. Also gofmt a few files that needed it.

pkg/util/set_test.go

@@ -43,13 +43,13 @@ func TestStringSet(t *testing.T) {
 		t.Errorf("Unexpected contents: %#v", s)
 	}
 	s.Insert("a")
-	if s.HasAll("a","b","d") {
+	if s.HasAll("a", "b", "d") {
 		t.Errorf("Unexpected contents: %#v", s)
 	}
-	if !s.HasAll("a","b",) {
+	if !s.HasAll("a", "b") {
 		t.Errorf("Missing contents: %#v", s)
 	}
-	s2.Insert("a","b","d")
+	s2.Insert("a", "b", "d")
 	if s.IsSuperset(s2) {
 		t.Errorf("Unexpected contents: %#v", s)
 	}