[ticket/11460] Drop incorrect phpbb_notification_{type,method}_ prefix.

PHPBB3-11460
[ticket/11460] Add methods for checkbox handling to phpbb_functional_test_case.

PHPBB3-11460
[ticket/11460] Add test for whether post_email and topic_email are checked.

PHPBB3-11460
[ticket/11460] Configure functional test board email using dummy SMTP data.

PHPBB3-11460
[ticket/11460] Add default behaviour tests for notification and email types.

PHPBB3-11460
Merge remote-tracking branch 'github-bantu/ticket/11460' into develop

* github-bantu/ticket/11460:
  [ticket/11460] Add default behaviour tests for notification and email types.
  [ticket/11460] Configure functional test board email using dummy SMTP data.
  [ticket/11460] Add test for whether post_email and topic_email are checked.
  [ticket/11460] Add methods for checkbox handling to phpbb_functional_test_case.
  [ticket/11460] Drop incorrect phpbb_notification_{type,method}_ prefix.