[tests] Fix relative imports in test files.

tests/test_image_support.py

@@ -14,8 +14,7 @@ import numpy
 import pytest
 
 from bob.io.base import load, write
-
-from ..test_utils import datafile, temporary_filename
+from bob.io.base.test_utils import datafile, temporary_filename
 
 # These are some global parameters for the test.
 PNG_INDEXED_COLOR = datafile("img_indexed_color.png", __name__)

tests/test_io.py

@@ -4,8 +4,7 @@ import numpy as np
 import pytest
 
 from bob.io.base import load, save, vstack_features
-
-from ..test_utils import temporary_filename
+from bob.io.base.test_utils import temporary_filename
 
 
 def test_io_vstack():