SOLR-5243: Killing a shard in one collection can result in leader election in a different collection if they share the same coreNodeName.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1524287 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5243: CHANGES entry.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1524289 13f79535-47bb-0310-9956-ffa450edef68