Update tasks for default cache configuration node

• With MGNLCACHE-55, we're adding support for multiple cache configurations. While the code still supports EhCacheFactory.get/setDefaultCacheConfiguration, we should migrate existing configurations to the better, new, layout. In short, this just means moving /modules/cache/config/cacheFactory/defaultCacheConfiguration to /modules/cache/config/cacheFactory/caches/default

• With MGNLCACHE-55, we're renaming CacheModule.configurations to contentCaching so we need to rename /modules/cache/config/configurations to contentCaching as well.

• With MGNLCACHE-32, we should probably update our default cache (some properties have been renamed and added between the versions)

• With MGNLCACHE-32, we can't use a cache called "default" (but a cache configuration named "default" is used for all unconfigured caches), so we need to rename /modules/cache/config/configurations/default to (for example) defaultPageCache, and change the value of /server/filters/cache/cacheConfigurationName accordingly. (because this name is used for both the contentCaching config name AND the actual cache name.

This also implies changes to info.magnolia.module.cache.filter.CacheConfigurationSetupTest

We'll also need to update a few modules (dam, commenting, ...) which add configuration to cache policies.