[BEAM-1542] Introduced SpannerIO.readAll#3591

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mairbek wants to merge 10 commits intoapache:masterfrom

mairbek:readrefactor

Commits on Jul 17, 2017

Inline buildSpannerOptions method
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Specify user agent.
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Commits on Jul 18, 2017

Changed format to be Apache_Beam_Java/%version%
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Introduced a ReadOperation abstraction.
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SpannerIO.readFn
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Commits on Jul 19, 2017

Documentation
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readFn -> readAll
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Commits on Jul 20, 2017

Reshuffle input
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readAll test
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happy checkstyle
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