[sfLucenePlugin] [solr] set the LockFactory to single by default
[sfLucenePlugin] [solr] set the LockFactory to single by default

git-svn-id: fa8f6aac7fa91a59a047d050b519651fa8da7087@25598 ee427ae8-e902-0410-961c-c3ed070cd9f9

rande/sfSolrPlugin,rande/sfSolrPlugin