[ticket/11615] Rename init_test to creation_test for clarity

PHPBB3-11615
[ticket/11615] Rename class in file to match

PHPBB3-11615
[ticket/11615] Remove magic number in creation_test

Removing this magic number to its own variable
with clean multiplication makes it clear
what the number represents.

PHPBB3-11615
[ticket/11615] Fix typo in creation_test

PHPBB3-11615
Merge remote-tracking branch 'asperous/ticket/11615/creation_test' into develop-olympus

* asperous/ticket/11615/creation_test:
  [ticket/11615] Fix typo in creation_test
  [ticket/11615] Remove magic number in creation_test
  [ticket/11615] Rename class in file to match
  [ticket/11615] Rename init_test to creation_test for clarity
[ticket/11618] Replace glob() with scandir() and string matching

Removes glob from template tests as glob() does not work on all
systems according to PHP documentation as has been noticed by users.

PHPBB3-11618
Merge remote-tracking branch 'Hardolaf/ticket/11618' into develop-olympus

* Hardolaf/ticket/11618:
  [ticket/11618] Replace glob() with scandir() and string matching