LUCENE-5803: Add DelegatingAnalyzerWrapper, an optimized variant of AnalyzerWrapper that doesn't allow to wrap components or readers

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1607998 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5803: Add more Javadocs to AnalyzerWrapper to encourage people to use DelegatingAnalyzerWrapper (if possible). Add changes entry for Solr.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1608005 13f79535-47bb-0310-9956-ffa450edef68