SOLR-5874,SOLR-5899: move CHANGES.txt entries to 4.7.1 section
SOLR-5874,SOLR-5899: move CHANGES.txt entries to 4.7.1 section

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1581220 13f79535-47bb-0310-9956-ffa450edef68

apache/solr,apache/solr,apache/solr,apache/solr,apache/solr