Refactoring to remove the last references to the old Razor class
structure (changing from a 'Rz' prefix to a 'Hnl' prefix in the classes
used by the Microkernel Controller) and redirecting stderr to /dev/null
for the external commands run by the HanlonMicrokernel::HnlMkHardwareFacter
class (previously, this stderr output would be mixed in with the regular
output from the commands that were run, resulting in parsing errors for
some commands when warnings were printed out as part of the output
of the command.