Failing tests
Helper for LRU LinkedHashMap
Maintain cache as desired.
Use CacheMap for other derived LinkedHashMap
Rename new class for clarity
Another test that goes through full stack
New HasStorage method
merge nathanlws: Fix TreeService Exchange caching

Merge pull request #1079 from nathanlws/sql-layer/fix-tree-service-exchange-caching
https://github.com/FoundationDB/sql-layer/pull/1079