Fix broken and circular imports

skimage/measure/_regionprops.py

@@ -4,7 +4,7 @@ from math import sqrt, atan2, pi as PI
 import numpy as np
 from scipy import ndimage
 
-from skimage.morphology import convex_hull_image
+from ..morphology.convex_hull import convex_hull_image
 from ._ccomp import label
 from . import _moments
 

skimage/morphology/tests/test_ccomp.py

@@ -3,7 +3,7 @@ from numpy.testing import assert_array_equal, run_module_suite
 
 from skimage.morphology import label
 from warnings import catch_warnings
-from _shared.util import skimage_deprecation
+from skimage._shared.utils import skimage_deprecation
 
 class TestConnectedComponents:
     def setup(self):