Fixed Bug #68478 acess_log don't use prefix

Calling fpm_conf_process_all_pools before fpm_log_open
allow to use fpm_evaluate_full_path and so to honor
global prefix or pool prefix for access.log
add test for global / pool prefix and bug #68478
minor typo in test
NEWS
Merge branch 'PHP-5.6'

* PHP-5.6:
  NEWS
  minor typo in test
  add test for global / pool prefix and bug #68478
  Fixed Bug #68478 acess_log don't use prefix