[SPARK-16193] [TESTS] Address flaky ExternalAppendOnlyMapSuite spilling tests#13896

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srowen:SPARK-16193

Commits on Jun 24, 2016

Make spill tests wait until job has completed before returning the number of stages that spilled
srowen
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Commits on Jun 25, 2016

Add timeout to new wait condition for safety
srowen
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