Follow Automation operations renaming with aliases: NXP-15991

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ERROR: test_real_conflict (nxdrive.tests.test_conflicts.TestConflicts)
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Traceback (most recent call last):
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/tests/test_conflicts.py", line 12, in setUp
    super(TestConflicts, self).setUp()
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/tests/common.py", line 117, in setUp
    password=self.password, base_folder=u'/', timeout=60)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/remote_document_client.py", line 82, in __init__
    base_folder_doc = self.fetch(base_folder)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/remote_document_client.py", line 374, in fetch
    return self.execute("Document.Fetch", value=ref)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/base_automation_client.py", line 283, in execute
    self._check_params(command, params)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/base_automation_client.py", line 542, in _check_params
    method = self._check_operation(command)
  File "/home/ataillefer/sources/nuxeo/addons/nuxeo-drive/nuxeo-drive-client/nxdrive/client/base_automation_client.py", line 538, in _check_operation
    % command)
ValueError: 'Document.Fetch' is not a registered operations.