[WSS-474] - Missing the 'EncodingType' attribute in element built by STRTransformUtil#createBSTX509
 - Thanks to Alessio Soldano.

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/branches/1_6_x-fixes@1513794 13f79535-47bb-0310-9956-ffa450edef68