SOLR-4729: Move CHANGES.txt entry to 4.3.0 (merged trunk r1476491)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1476492 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4729: Remove CHANGES.txt entry from 4.4.0 (merge trunk r1476493)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1476495 13f79535-47bb-0310-9956-ffa450edef68