test: don't use sys.maxint for python3 compatibility

use sys.maxsize, see discussion on
nexedi/erp5!1751 (comment 203735)

bt5/erp5_core_test/TestTemplateItem/portal_components/test.erp5.testERP5Catalog.py

@@ -571,7 +571,8 @@ class TestERP5Catalog(ERP5TypeTestCase, LogInterceptor):
     # otherwise it returns the object
     self.assertEqual(obj, portal_catalog.getObject(obj.getUid()).getObject())
     # but raises KeyError if object is not in catalog
-    self.assertRaises(KeyError, portal_catalog.getObject, sys.maxint)
+    self.assertRaises(KeyError, portal_catalog.getObject, sys.maxsize)
+    self.assertRaises(KeyError, portal_catalog.getObject, -1)
 
   def test_getRecordForUid(self):
     portal_catalog = self.getCatalogTool()
@@ -583,7 +584,8 @@ class TestERP5Catalog(ERP5TypeTestCase, LogInterceptor):
     portal_catalog = self.getCatalogTool()
     obj = self._makeOrganisation()
     self.assertEqual(obj.getPath(), portal_catalog.getpath(obj.getUid()))
-    self.assertRaises(KeyError, portal_catalog.getpath, sys.maxint)
+    self.assertRaises(KeyError, portal_catalog.getpath, sys.maxsize)
+    self.assertRaises(KeyError, portal_catalog.getpath, -1)
 
   def test_16_newUid(self):
     # newUid should not assign the same uid

product/ERP5Type/tests/ERP5TypeTestSuite.py

@@ -148,7 +148,7 @@ class SavedTestSuite(ERP5TypeTestSuite):
   def __init__(self, *args, **kw):
     # Use same portal id for all tests run by current instance
     # but keep it (per-run) random.
-    self._portal_id = 'portal_%i' % (random.randint(0, sys.maxint), )
+    self._portal_id = 'portal_%i' % (random.randint(0, sys.maxsize), )
     self._setup_failed = False
     super(SavedTestSuite, self).__init__(*args, **kw)