GHSA-RCM4-JV5G-WCCM zfr authentication adapter did not verify validity of tokens

Previous to @2ca5bb1c2f11537be8f94ca6867d8d69789e744a release 0.1.2, tokens weren't checked for validity/expiration. This potentially caused a security issue if expired tokens were not deleted after the expiration time was past, allowing anyone to still use invalidated authentication credentials...