Fix authority-related bugs

- migration patch uses non-public authority service
- root authority query ignores deleted nodes
- avoid exception for getContainingAuthorities("System")
- update unit test to cope with corrected EMAIL_CONTRIBUTORS group and slight difference in behaviour with root authorities

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@14609 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/domain/hibernate/Node.hbm.xml

@@ -787,6 +787,7 @@
          s.protocol = :storeProtocol AND
          s.identifier = :storeIdentifier AND
          n.type_qname_id = :nodeTypeQNameID AND
+         n.node_deleted = :isDeleted AND
          a.child_node_id IS NULL
    </sql-query>