erp5_ui_test_core: Make waitForActivities independent from the number of...

erp5_ui_test_core: Make waitForActivities independent from the number of activities processed per tic.

That number was vastly decreased, causing UI tests to bail with "tic is
looping forever" for no good reason.
Convert such logic into a deadline one.

bt5/erp5_ui_test_core/ExtensionTemplateItem/portal_components/extension.erp5.ERP5Zuite.py

+import itertools
+import time
 from Products.CMFActivity.Activity.Queue import VALIDATION_ERROR_DELAY
 
-def waitForActivities(self, count=1000):
+def waitForActivities(self, delay=100, count=None):
   """
     We wait until all activities are finished
 
     RuntimeError is raised in case there is no way
     to finish activities.
   """
+  if count is not None: # BBB
+    # completely arbitrary conversion factor: count used to default to 1000
+    # and I (just as arbitrarily) converted that into a 100s default maximum
+    # tolerable wait delay before bailing.
+    delay = count / 10.
+  deadline = time.time() + delay
   activity_tool = self.getPortalObject().portal_activities
-  while count > 0:
-    count -= 1
+  for call_count in itertools.count():
     x = activity_tool.getMessageList()
     if not x:
       return 'Done.'
     if all(x.processing_node == -2 for x in x):
       break
     activity_tool.process_timer(None, None)
-    if count % 10 == 0:
+    if time.time() > deadline:
+      break
+    if call_count % 10 == 0:
       activity_tool.timeShift(3 * VALIDATION_ERROR_DELAY)
   raise RuntimeError('tic is looping forever.')