[MINOR] Guard against crashing on invalid key range queries#6521

Merged

bbejeck merged 10 commits intoapache:trunkfrom

ableegoldman:GuardKeyRangeQueries

Apr 10, 2019

Commits on Mar 29, 2019

Guard against crashing on invalid key range queries in CachingXXXStores
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Added guards for range queries in in-memory stores
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Commits on Apr 4, 2019

Changed DEBUG log level to WARN
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Commits on Apr 5, 2019

Addressing comments from Bruno's review
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Added unit tests, guard range in MemoryNavigableLRUCache, expanded error messages
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Use LogAppender to catch and check logged messages in unit tests
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