Fix random failure on CMIS tests

13:36:36 [ERROR]      [echo] ======================================================================
13:36:36 [ERROR]      [echo] ERROR: testCheckinAfterGetPWC (cmislibtest.DocumentTest)
13:36:36 [ERROR]      [echo] Create a document in a test folder, check it out, call getPWC, then checkin
13:36:36 [ERROR]      [echo] ----------------------------------------------------------------------
13:36:36 [ERROR]      [echo] Traceback (most recent call last):
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislibtest.py", line 911, in testCheckinAfterGetPWC
13:36:36 [ERROR]      [echo]     testDoc.checkout()
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislib\atompub\binding.py", line 2279, in checkout
13:36:36 [ERROR]      [echo]     ATOM_XML_ENTRY_TYPE)
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislib\atompub\binding.py", line 187, in post
13:36:36 [ERROR]      [echo]     self._processCommonErrors(resp, url)
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislib\cmis_services.py", line 62, in _processCommonErrors
13:36:36 [ERROR]      [echo]     raise UpdateConflictException(error['status'], url)
13:36:36 [ERROR]      [echo] UpdateConflictException: Error 409 at http://localhost:8080/nuxeo/atom/cmis/default/checkedout
13:36:36 [ERROR]      [echo] ======================================================================
13:36:36 [ERROR]      [echo] ERROR: testDeleteContentStreamPWC (cmislibtest.DocumentTest)
13:36:36 [ERROR]      [echo] Delete the content stream of a PWC
13:36:36 [ERROR]      [echo] ----------------------------------------------------------------------
13:36:36 [ERROR]      [echo] Traceback (most recent call last):
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislibtest.py", line 1198, in testDeleteContentStreamPWC
13:36:36 [ERROR]      [echo]     pwc = newDoc.checkout()
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislib\atompub\binding.py", line 2279, in checkout
13:36:36 [ERROR]      [echo]     ATOM_XML_ENTRY_TYPE)
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislib\atompub\binding.py", line 187, in post
13:36:36 [ERROR]      [echo]     self._processCommonErrors(resp, url)
13:36:36 [ERROR]      [echo]   File "C:\Jenkins\workspace\master\FT-nuxeo-master-cmis-cap-tomcat-multidb-windows\Slave\MULTIDB_WINDOWS\dbprofile\mssql\jdk\java-8-oracle\nuxeo-distribution\nuxeo-distribution-cap-cmis-tests\cmislib\cmis_services.py", line 62, in _processCommonErrors
13:36:36 [ERROR]      [echo]     raise UpdateConflictException(error['status'], url)
13:36:36 [ERROR]      [echo] UpdateConflictException: Error 409 at http://localhost:8080/nuxeo/atom/cmis/default/checkedout
13:36:36 [ERROR]      [echo] ----------------------------------------------------------------------

13:40:05 [ERROR]      [echo] ======================================================================
13:40:05 [ERROR]      [echo] ERROR: testSetContentStreamPWC (cmislibtest.DocumentTest)
13:40:05 [ERROR]      [echo] Set the content stream on the PWC
13:40:05 [ERROR]      [echo] ----------------------------------------------------------------------
13:40:05 [ERROR]      [echo] Traceback (most recent call last):
13:40:05 [ERROR]      [echo]   File "/opt/jenkins/workspace/master/FT-nuxeo-master-cmis-cap-tomcat-multidb-linux/Slave/MULTIDB_LINUX/dbprofile/oracle12c/jdk/java-8-oracle/nuxeo-distribution/nuxeo-distribution-cap-cmis-tests/cmislibtest.py", line 1076, in testSetContentStreamPWC
13:40:05 [ERROR]      [echo]     pwc = newDoc.checkout()
13:40:05 [ERROR]      [echo]   File "/opt/jenkins/workspace/master/FT-nuxeo-master-cmis-cap-tomcat-multidb-linux/Slave/MULTIDB_LINUX/dbprofile/oracle12c/jdk/java-8-oracle/nuxeo-distribution/nuxeo-distribution-cap-cmis-tests/cmislib/atompub/binding.py", line 2279, in checkout
13:40:05 [ERROR]      [echo]     ATOM_XML_ENTRY_TYPE)
13:40:05 [ERROR]      [echo]   File "/opt/jenkins/workspace/master/FT-nuxeo-master-cmis-cap-tomcat-multidb-linux/Slave/MULTIDB_LINUX/dbprofile/oracle12c/jdk/java-8-oracle/nuxeo-distribution/nuxeo-distribution-cap-cmis-tests/cmislib/atompub/binding.py", line 187, in post
13:40:05 [ERROR]      [echo]     self._processCommonErrors(resp, url)
13:40:05 [ERROR]      [echo]   File "/opt/jenkins/workspace/master/FT-nuxeo-master-cmis-cap-tomcat-multidb-linux/Slave/MULTIDB_LINUX/dbprofile/oracle12c/jdk/java-8-oracle/nuxeo-distribution/nuxeo-distribution-cap-cmis-tests/cmislib/cmis_services.py", line 62, in _processCommonErrors
13:40:05 [ERROR]      [echo]     raise UpdateConflictException(error['status'], url)
13:40:05 [ERROR]      [echo] UpdateConflictException: Error 409 at http://localhost:8080/nuxeo/atom/cmis/default/checkedout
13:40:05 [ERROR]      [echo] ----------------------------------------------------------------------