Fix file descriptor leaks and add test

* Add response.Body.Close() where needed to release HTTP
  connections to API server.
* Add tests to ensure no general leaks occur. 100% coverage would be
  required to ensure no leaks on any call.
* Update code comments to be godoc correct

Signed-off-by: Jhon Honce <jhonce@redhat.com>

pkg/bindings/containers/commit.go

@@ -28,5 +28,7 @@ func Commit(ctx context.Context, nameOrID string, options *CommitOptions) (handl
 	if err != nil {
 		return id, err
 	}
+	defer response.Body.Close()
+
 	return id, response.Process(&id)
 }