Products.ERP5Type.tests.ProcessingNodeTestCase: Extend default timeout.

Several tests are failing on test nodes with the chosen 100s timeout.
Increase it to 10 minutes. Longer, more exceptional, calls may benefit
from exposing this delay as a tic argument.

product/ERP5Type/tests/ProcessingNodeTestCase.py

@@ -280,7 +280,7 @@ class ProcessingNodeTestCase(ZopeTestCase.TestCase):
         ZopeTestCase._print('Executing pending activities ...')
         old_message_count = 0
       start = time.time()
-      deadline = start + 100 # This prevents an infinite loop.
+      deadline = start + 600 # This prevents an infinite loop.
       getMessageList = portal_activities.getMessageList
       message_list = getMessageList()
       message_count = len(message_list)