Implement defconfig compared bisection.
Implement defconfig compared bisection.

Change-Id: Ia4582849b2f84e1904cd9a05503e3c16ca17a895

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