Add initial support for RH-based systems

Add initial support for RH-based systems that do not provide a sysfs "service," or even an init script.

This just looks for "redhattish" boxes based on $osfamily, and exec{} a short awk script to set values in /sys.  It's tested on Fedora boxes, but should work on other Red Hat-based distros (RHEL, CentOS, etc).