SOLR-6433: Solr startup scripts should be executable

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LUCENE-5900: More Version cleanup (merged 1620509)

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Revert accidental commit (was still working on merge)

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LUCENE-5900: More Version cleanup (merged 1620509)

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fix spelling in comment

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do test merge stability for Lucene41PF

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SOLR-6410: Ensure all Lookup instances are closed via CloseHook - move CHANGES.txt entry for 4.10 backport (merge r1620674)

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ensure test closes the infoStream it opens (merge r1620691)

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SOLR-6387: additional map-reduce test that does forking and needs 'tr' check (merge r1620707)

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