SHS-NG M4.6: Add "max" and "last" to kvstore iterators. #12
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The only remaining use of this class was the SparkStatusTracker, which was modified to use the new state store. The test code to wait for executors was moved to TestUtils and now uses the SparkStatusTracker API. As part of this change I also modified the streaming UI to read the needed data from the store, which was missed in the previous patch that made JobProgressListener redundant.
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This makes it easier for callers to control the end of iteration,
making it easier to write Scala code that automatically closes
underlying iterator resources. Before, code had to use Scala's
"takeWhile", convert the result to a list, and manually close the
iterators; with these two parameters, that can be avoided in a
bunch of cases, with iterators auto-closing when the last element
is reached.