Fix bug #68463 listen.allowed_clients can silently result in no allowed access

Add a "There are no allowed addresses for this pool"
adapt test for error message introduce in fix for #68463
NEWS
Merge branch 'PHP-5.6'

* PHP-5.6:
  NEWS
  adapt test for error message introduce in fix for #68463
  Fix bug #68463 listen.allowed_clients can silently result in no allowed access