SOLR-6089: When using the HDFS block cache, when a file is deleted, it's underlying data entries in the block cache are not removed, which is a problem with the global block cache option. 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1619431 13f79535-47bb-0310-9956-ffa450edef68