SOLR-6182: correctly cast managedData as a List<Object> when loading stored RestManager data; solution verified with manual testing only as the unit tests use in-memory storage so will need to re-work the backing store to test this behavior in the unit test.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1604078 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6182: add to change list for 4.9 release

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1604085 13f79535-47bb-0310-9956-ffa450edef68