Drive: fix HTTP 400 issue related to token revocation at tests tear down

15:02:04 [INFO]      [exec] ======================================================================
15:02:04 [INFO]      [exec] ERROR: test_local_replace (nxdrive.tests.test_integration_windows.TestIntegrationWindows)
15:02:04 [INFO]      [exec] ----------------------------------------------------------------------
15:02:04 [INFO]      [exec] Traceback (most recent call last):
15:02:04 [INFO]      [exec]   File "/home/hudson/tmp/workspace/FT-nuxeo-drive-master-linux/nuxeo-drive-client/nxdrive/tests/common.py", line 156, in tearDown
15:02:04 [INFO]      [exec]     self.remote_document_client_1.revoke_token()
15:02:04 [INFO]      [exec]   File "/home/hudson/tmp/workspace/FT-nuxeo-drive-master-linux/nuxeo-drive-client/nxdrive/client/base_automation_client.py", line 518, in revoke_token
15:02:04 [INFO]      [exec]     self.request_token(revoke=True)
15:02:04 [INFO]      [exec]   File "/home/hudson/tmp/workspace/FT-nuxeo-drive-master-linux/nuxeo-drive-client/nxdrive/client/base_automation_client.py", line 505, in request_token
15:02:04 [INFO]      [exec]     raise e
15:02:04 [INFO]      [exec] HTTPError: HTTP Error 400: Failed to connect to Nuxeo server http://localhost:8080/nuxeo/ with user nuxeoDriveTestUser_user_1 to acquire a token: HTTP error 400