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/api/helpers_test.go

@@ -63,7 +63,7 @@ func TestSemantic(t *testing.T) {
 
 	for index, item := range table {
 		if e, a := item.shouldEqual, Semantic.DeepEqual(item.a, item.b); e != a {
-			t.Errorf("expected %v, got %v.", index, e, a)
+			t.Errorf("case[%d], expected %v, got %v.", index, e, a)
 		}
 	}
 }