SOLR-2452: added build/testOutputDirectory, even though solrj tests are not run under solrj module, because without it, 'mvn clean' deletes the whole module (solr/solrj/) in addition to the build directory solr/build/solr-solrj/.
SOLR-2452: added build/testOutputDirectory, even though solrj tests are not run under solrj module, because without it, 'mvn clean' deletes the whole module (solr/solrj/) in addition to the build directory solr/build/solr-solrj/.

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1144903 13f79535-47bb-0310-9956-ffa450edef68

PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr