batch: Refactor token validation decorator.
batch: Refactor token validation decorator.

  * Remove decorator use and wrap functions with validation
    logic.

Change-Id: I63063945a2e83cb1b7a00a13853e9f599d34c403

joyxu/kernelci-backend,kernelci/kernelci-backend,kernelci/kernelci-backend,joyxu/kernelci-backend,joyxu/kernelci-backend