Fix defconfig bisect.
Fix defconfig bisect.

  * It was searching in the wrong collection.
  * Also, add a first search to find the defconfig with PASS status
    in order to limit even more the search.

Change-Id: I7d5edb20b3f54ed6f288c552d19ab63567dcf9ac

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