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/volume/secret/secret_test.go

@@ -103,7 +103,7 @@ func TestPlugin(t *testing.T) {
 		t.Errorf("Failed to make a new Builder: %v", err)
 	}
 	if builder == nil {
-		t.Errorf("Got a nil Builder: %v")
+		t.Errorf("Got a nil Builder")
 	}
 
 	volumePath := builder.GetPath()
@@ -145,7 +145,7 @@ func TestPlugin(t *testing.T) {
 		t.Errorf("Failed to make a new Cleaner: %v", err)
 	}
 	if cleaner == nil {
-		t.Errorf("Got a nil Cleaner: %v")
+		t.Errorf("Got a nil Cleaner")
 	}
 
 	if err := cleaner.TearDown(); err != nil {