LUCENE-5154: fix test to use getTempDir instead of CWD

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1508720 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5154: move test logging config to where it will actually work in solrj tests

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1508722 13f79535-47bb-0310-9956-ffa450edef68