LUCENE-6922: more improvements in the svn to git mirror workaround tool
LUCENE-6922: more improvements in the svn to git mirror workaround tool

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1723747 13f79535-47bb-0310-9956-ffa450edef68

apache/solr,apache/solr,apache/solr,apache/solr,apache/solr