Bug - Size parameter seems useless for stand-alone server cache (naive)

[nick-rv]

According to the current cache implementation (573c3ce) the naive cache size can be set.

But this do not seem to make sense as the naive data structure is base on a map.
As in go language the map allocation is handled internally.
Thus the optional capacity is only a hint and not a limitation.

This is the reason why the following paramters seem useless :

• conf.Configuration.Cache.Naive.MapSize
• PGFS_CACHE_NAIVE_SIZE env variable