SOLR-6444: Disable test that still fails in Jenkins sometimes.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1621206 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6443: Disable test that fails on Jenkins until we can determine the problem.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1621207 13f79535-47bb-0310-9956-ffa450edef68