[TYPO3-core] FYI72: Bug #15388: [Caching framework] Remove default settings for cache configuration

[Christian Kuhn]

The following patch will be committed in 72 hours if nobody objects

Type: bugfix, cleanup

BT: http://bugs.typo3.org/view.php?id=15388

Branches: trunk, 4.4

Problem:
The cache manager has some logic to fall back to default frontend and 
backend definitions if caches are initialized, but not fully defined:
- While these settings might make sense for FLOW3, they are not usefull 
for v4. In v4 all caches should be defined in TYPO3_CONF_VARS.
- The defaults are of very limited use, it's usually not possible to 
change a frontend for a cache, and most backends require additional options.
- The defaults are only used in t3lib_cache_manager initialize(), it 
doesn't use the defined defaultFrontend / defaultBackend settings from 
TYPO3_CONF_VARS, but own class internal definitions. The method is not 
used in the core, and it must not be used by an extension.

Solution:
- Remove defaultFrontend / defaultBackend definition from 
TYPO3_CONF_VARS (not used throughout the core)
- Remove default definitions in t3lib_cache_manager
- Remove default usage in initialize() of t3lib_cache_manager
- Adapt a unit test

Regards
Christian
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