Skip test_gluon_data.py on OSX (apache#17969)

* Skip gluon data tests with multi-worker on OSX

uncaught exception of type dmlc::Error: [03:02:35] ../src/storage/./cpu_shared_storage_manager.h:218: Check failed: count >= 0 (-1 vs. 0) :

* Fix whitespace

.github/workflows/os_x_staticbuild.yml

@@ -22,5 +22,4 @@ jobs:
           python3 -m pip install --user -e python
       - name: Test project
         run: |
-          python3 -m nose --with-timer --verbose tests/python/unittest/ --exclude-test=test_extensions.test_subgraph --exclude-test=test_extensions.test_custom_op --exclude-test=test_gluon_data.test_recordimage_dataset_with_data_loader_multiworker
-          
+          python3 -m nose --with-timer --verbose tests/python/unittest/ --exclude-test=test_extensions.test_subgraph --exclude-test=test_extensions.test_custom_op --exclude-test=test_gluon_data.test_recordimage_dataset_with_data_loader_multiworker --exclude-test=test_gluon_data.test_multi_worker --exclude-test=test_gluon_data.test_multi_worker_shape --exclude-test=test_gluon_data.test_multi_worker_forked_data_loader --exclude-test=test_gluon_data.test_multi_worker_dataloader_release_pool

tests/python/unittest/test_gluon_data.py

@@ -270,11 +270,6 @@ def test_multi_worker_dataloader_release_pool():
         print('Skip for windows since spawn on windows is too expensive.')
         return
 
-    from sys import platform
-    if platform == 'darwin':
-        print('Skip for MacOS due to https://github.com/apache/incubator-mxnet/issues/17782')
-        return
-
     for _ in range(10):
         A = np.random.rand(999, 2000)
         D = mx.gluon.data.DataLoader(A, batch_size=8, num_workers=8)