LUCENE-5773: Test SegmentReader.ramBytesUsed.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1603484 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6173: Fixed wrong failure message in TestDistributedSearch

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1603495 13f79535-47bb-0310-9956-ffa450edef68