tests: some nightly tests need solr.hdfs.home - just always set it

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1554107 13f79535-47bb-0310-9956-ffa450edef68
when sending a non retry update fails, log it at warn level

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1554109 13f79535-47bb-0310-9956-ffa450edef68