ARROW-1866: [Java] Combine MapVector classes and remove NonNullableMapVector#1371

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BryanCutler wants to merge 8 commits intoapache:masterfrom

BryanCutler:java-combine-MapVectors-ARROW-1866

Commits on Dec 1, 2017

removed NonNullableMapVector

BryanCutler
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wesm
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Combined MapVector classes, is compiling but tests fail

BryanCutler
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wesm
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fixed bug when MapWriter was created before fieldType assigned

BryanCutler
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wesm
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fixed ComplexWriterTest that needed validity vector to be allocated

BryanCutler
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wesm
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also need to properly set index when starting SingleMapWriter now

BryanCutler
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wesm
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some cleanup in MapVector

BryanCutler
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wesm
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made valueCount private

BryanCutler
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wesm
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removed duplicate imports and unnecessary casting

BryanCutler
authored and
wesm
committed