[SPARK-16525][SQL] Enable Row Based HashMap in HashAggregateExec#14176

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ooq wants to merge 9 commits intoapache:masterfrom

ooq:rowbasedfastaggmap-pr2

Commits on Jul 27, 2016

Enable row-based fast hashmap and set it as default in auto mode.
ooq
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Remove the configuration flag that sets maximum column width for vectorized hashmap
ooq
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Commits on Jul 28, 2016

Fix klen and vlen in FixedLengthRowBasedKeyValueBatch (making multiples of 8).
ooq
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Fix writing DecimalType bug in RowBasedHashMapGenerator.
ooq
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Commits on Aug 1, 2016

Commits on Aug 3, 2016

Commits on Aug 24, 2016

Update flag settings and tests.
ooq
committed