GNU/Linux: random bug test_update_local_file_content_update_remote_file_property

[INFO]      [exec] FAIL: test_update_local_file_content_update_remote_file_property (nxdrive.tests.test_concurrent_synchronization.TestConcurrentSynchronization)
[INFO]      [exec] ----------------------------------------------------------------------
[INFO]      [exec] Traceback (most recent call last):
[INFO]      [exec]   File "/opt/jenkins/workspace/master/FT-nuxeo-drive-master-linux/nuxeo-drive-client/nxdrive/tests/test_concurrent_synchronization.py", line 250, in test_update_local_file_content_update_remote_file_property
[INFO]      [exec]     self.assertEqual(remote.get_content('/test.odt'), 'Updated content.')
[INFO]      [exec] AssertionError: 'Some content.' != 'Updated content.'