Fixes Lucene.Net.Index.TestIndexWriter::TestThreadInterruptDeadlock() and Lucene.Net.Index.TestIndexWriter::TestTwoThreadsInterruptDeadlock() #525

…extra Thread.Sleep(0) call in IndexWriter.Dispose().

…it in all of the places that Lucene does.

… handle entering locks without throwing System.Threading.ThreadInterruptedException (which is what happens in Java)

…tor.Enter and UninterruptableMonitor.Exit to prevent ThreadInterruptedException from occurring when entering a lock.

…erruptableMonitor.Enter and UninterruptableMonitor.Exit to prevent ThreadInterruptedException from occurring when entering a lock.

…d UninterruptableMonitor.Exit to prevent ThreadInterruptedException from occurring when entering a lock.

…ing when clause on catch block

… from TestThreadInterruptDeadlock() and TestTwoThreadsInterruptDeadlock(), since they now are passing

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