After #29964 was merged the cmd.script and cmd.script_retcode tests on centos 5
started failing because the /usr/bin/env python version is the system default.
The script used print_fuction from __futures__ which was not introduced until
python2.6.
@The-Loeki, I noticed this after your changes to cmdmod function. If you have
thoughts or comments as to why this behavior changed after that, I'm all ears.
othersie, this should take care of the failures on centos 5 on jenkins.