* p/ticket/9983:
[ticket/9983] Also check generic APC enable/disable.
[ticket/9983] Use APC instead of apc in error messages.
[ticket/9983] Skip tests if APC is not enabled for CLI.
[ticket/9983] Test for apc cache driver.
[ticket/9983] Add phpbb prefix to global variables.
[ticket/9983] Empty line by request.
[ticket/9983] Indeed, it is <?php.
[ticket/9983] Add a test for destroy.
[ticket/9983] Exercise exists also.
[ticket/9983] Add a purge test.
[ticket/9983] Rename test methods.
[ticket/9983] get/put cache test moved to a base class.
[ticket/9983] Create driver in setup in null driver test.
[ticket/9983] Split cache test into per-driver files.
[ticket/9983] Add redis cache driver tests.
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