enable CVMFS_CACHE_REFCOUNT by default #18
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The new CVMFS_CACHE_REFCOUNT setting was added in CVMFS v2.11.
Based on https://indico.cern.ch/event/1338689/contributions/6010994/attachments/2953764/5192993/presentation_prom.pdf there is no downside to activating it, and it will be especially important for keeping file descriptor usage in check on newer many-core systems.