WFLY-3189 - Add XML schema for namespace "urn:clustering:1.0" which is mentioned in
https://docs.jboss.org/author/display/AS71/jboss-ejb3.xml+Reference, but
missing this plugin and in JBoss EAP 6 distribution. Based on
"jboss-ejb-security_1.0.xsd".
WFLY-3189 - update unit test to ignore new xsd file