UtilCache maxSize/maxInMemory

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UtilCache maxSize/maxInMemory

Adam Heath-2
Bother, what a mess.  maxInMemory is only processed during the
constructor, and setPropertiesParam.  It is then used to set the
initial LRU setting in CacheLineTable.

However, maxSize, which is supposed to limit the total size, has no
bearing whatsoever.

Then, setMaxSize() sets a new LRU, but instead of changing the
maxInMemory value, changes the maxSize value.

Fixing this is not hard, but it means changing the meaning of
setMaxSize(), which could affect external callers.  I currently see
only one in-tree call, in UtilCacheEvents.