Fix EZP-21940: delete location doesn't fully expire stash cache

Make sure to expire content/locations/<contentId> cache,
For this to work, LocationHandler must use rootLocation as a separate cache key part.
Also fix UrlAliasHandler Cache to use separate stash keys.
Merge pull request #616 from joaoinacio/EZP-21940_remove_locations_cache

Fix EZP-21940: delete location doesn't fully expire stash cache