Try to find a secure part by Id first. Required for a use-case of signing/encrypting two BinarySecurityTokens (Kerberos SignedSupportingToken + Asymmetric ProtectTokens)

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1549599 13f79535-47bb-0310-9956-ffa450edef68