[ticket/11868] Replace phpbb_request_interface references

PHPBB3-11868
[ticket/11868] Add functional test for registration

PHPBB3-11868
Merge pull request #3 from nickvergessen/ticket/cyberalien/11868

Ticket/cyberalien/11868
[ticket/11868] Add @depends to test

PHPBB3-11868
Merge remote-tracking branch 'cyberalien/ticket/11868' into develop

* cyberalien/ticket/11868:
  [ticket/11868] Add @depends to test
  [ticket/11868] Add functional test for registration
  [ticket/11868] Replace phpbb_request_interface references