SOLR-5980: AbstractFullDistribZkTestBase#compareResults always returns false for shouldFail.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1586782 13f79535-47bb-0310-9956-ffa450edef68
don't processEvents during rollback; prevent possible deadlock during IW.rollback

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tests: harden this test due to a current short coming in the collections api.

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LUCENE-5603: fix hunspell to use FST efficiently

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SOLR-5980: Add a test.

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merge 4.7.2 CHANGES

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LUCENE-5604: switch BytesRef/BytesRefHash hashing to MurmurHash3

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LUCENE-5604: woops, remove diagnostic conflict counter

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LUCENE-5602: CHANGES shuffle

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LUCENE-5067: add a BaseDirectoryTestCase

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LUCENE-5067: fix testThreadSafety to actually test the dir in question (not copy into random impl), fix performance issues, remove Nightly

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pulling in changes from solr2052 on trunk