[WSS-498] - Retrieving of public key from certificates in missing for signed results in compare credential method of org.apache.wss4j.dom.saml.DOMSAMLUtil

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1589755 13f79535-47bb-0310-9956-ffa450edef68