Just retrieve KeyInfoFactory from the SignatureFactory

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1614603 13f79535-47bb-0310-9956-ffa450edef68
Removing stacktrace

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1614605 13f79535-47bb-0310-9956-ffa450edef68