base: Use wrapper function instead of single ones.
base: Use wrapper function instead of single ones.

  * Instead of importing and calling each function, use the
    wrapper one provided.

Change-Id: I0e8d251e9d243854d48a23b7b0c95507990ee21a

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