SOLR-6883: CLUSTERPROP API switch case does not call break

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1647551 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6882: Misspelled collection API actions in ReplicaMutator exception messages

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1647553 13f79535-47bb-0310-9956-ffa450edef68