Move f/utils => f/internal; move testing libs to fair_dev/testing (#1004)

tests/utils/test_reduce_scatter_bucketer.py

@@ -12,9 +12,9 @@ from unittest import mock
 from parameterized import parameterized
 import torch
 
-from fairscale.utils import torch_version
-from fairscale.utils.reduce_scatter_bucketer import ReduceScatterBucketer
-from fairscale.utils.testing import dist_init, spawn_for_all_world_sizes
+from fair_dev.testing.testing import dist_init, spawn_for_all_world_sizes
+from fairscale.internal import torch_version
+from fairscale.internal.reduce_scatter_bucketer import ReduceScatterBucketer
 
 
 def rename_test(testcase_func, param_num, param):

tests/utils/test_state_dict.py

@@ -12,7 +12,7 @@
 import torch
 from torch import nn
 
-from fairscale.utils.state_dict import find_module_instances, replace_by_prefix_
+from fairscale.internal.state_dict import find_module_instances, replace_by_prefix_
 
 
 def test_find_module_instances():

tests/utils/test_version.py

-from fairscale.utils import torch_version
+from fairscale.internal import torch_version
 
 
 def test_torch_version():