Two first simple tests to check functionality of session_begin and
session_create.
Added a mock class for the cache as well as a subclass of session
which has its cookie handling function mocked out to avoid header
sending problems.
PHPBB3-9732
* develop-olympus:
[task/session-tests] Make result check independent of returned row order.
[task/session-tests] By default the cache check now skips over db server info
[task/session-tests] Correctly display message on session continue test failure
[task/session-tests] Make the session id replacement of dataset values clearer
Conflicts:
tests/mock/cache.php
* develop-olympus:
[ticket/10052] Add comments to the session testable factory.
[ticket/10052] Correct session tests, and separate session factory from tests
