SOLR-3706: straighten out license files and jar checksums

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1461719 13f79535-47bb-0310-9956-ffa450edef68
remove __pycahce__

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1461726 13f79535-47bb-0310-9956-ffa450edef68