Fixing a lot of string formatting issues with regards to:

* Improper format specifier (e.g. %s for bools or %s for ints)
  * More or less parameters than format specifiers
  * Not calling a formatting function when it should have (e.g. Error() instead of Errorf())

pkg/labels/selector_test.go

@@ -322,7 +322,7 @@ func TestToString(t *testing.T) {
 	}
 	for _, ts := range toStringTests {
 		if out := ts.In.String(); out == "" && ts.Valid {
-			t.Errorf("%+v.String() => '%v' expected no error", ts.In)
+			t.Errorf("%+v.String() => '%v' expected no error", ts.In, out)
 		} else if out != ts.Out {
 			t.Errorf("%+v.String() => '%v' want '%v'", ts.In, out, ts.Out)
 		}