Add check on startup for Lucene locks that were left behind

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      If JIRA is stopped whilst Lucene is reindexing itself, it may leave a lock file behind. This will cause issue indexing to fail on subsequent startups and they will get errors like 

      Caused by: java.io.IOException: Lock obtain timed out: Lock@/usr/prod/jira/atlassian-jira-enterprise-3.4.3-standalone/temp/lucene-9683c976083ae985fecc9c87bdbac47b-commit.lock
	 at org.apache.lucene.store.Lock.obtain(Lock.java:58)
	 at org.apache.lucene.store.Lock$With.run(Lock.java:108)
	 at org.apache.lucene.index.IndexReader.open(IndexReader.java:111)
	 at org.apache.lucene.index.IndexReader.open(IndexReader.java:95)
	 at com.atlassian.jira.util.LuceneUtils.getIndexReader(LuceneUtils.java:31)

      The solution is for the user to stop JIRA, and remove the file before starting JIRA again.

      We should add a Johnson Filter to run this check at startup and give them the appropriate instructions / warning if this occurred.

              Assignee:
              Chris Mountford
              Reporter:
              MarkC
              Votes:
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                Created:
                Updated:
                Resolved: