Fix https://github.com/google/guava/issues/3570

[tomasisonfire]

Fix #3570 by resetting expandTableThreshold and maxRunBeforeFallback after resizing the hashTable. Unit test included: testReuseBuilderReducingHashTableSizeWithPowerOfTwoTotalElements

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[tomasisonfire]

@googlebot I signed it!

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[lowasser]

We don't typically include final as you do here, considering it redundant -- it does happen to be final, but that has no real importance to the correctness of the test.