I also tried installing devtest on a CentOS 7.1 box, and although the output was different, I also got:
install failed with error Running install-packages install. Package list: PyYAML
So it definitely doesn't seem to be affected by which system you build on, no matter what I am getting errors about PyYAML that prevent devtest_ramdisk.sh from creating the images.
I also tried installing devtest on a CentOS 7.1 box, and although the output was different, I also got:
install failed with error Running install-packages install. Package list: PyYAML
So it definitely doesn't seem to be affected by which system you build on, no matter what I am getting errors about PyYAML that prevent devtest_ramdisk.sh from creating the images.