explicitly install 'Sessions' Product, that is required for testOOoImport on Zope-2.12.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39039 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -98,6 +98,7 @@ ZopeTestCase.installProduct('MailHost', quiet=install_product_quiet)
 ZopeTestCase.installProduct('PageTemplates', quiet=install_product_quiet)
 ZopeTestCase.installProduct('PythonScripts', quiet=install_product_quiet)
 ZopeTestCase.installProduct('ExternalMethod', quiet=install_product_quiet)
+ZopeTestCase.installProduct('Sessions', quiet=install_product_quiet)
 
 try:
   from Testing.ZopeTestCase.layer import onsetup