Replaced calls to decryptAuthToken with calls to validateAuthToken. The difference is that the validate method also checks expiry times on tokens. The call decrpytAuthToken will be made private to avoid this problem in future.

git-svn-id: https://svn.apache.org/repos/asf/wookie/trunk@1574046 13f79535-47bb-0310-9956-ffa450edef68