Modified pack-scan report columns, added support for older RHEL dmidecode

[mdvickst]

• Added additional columns to the pack-scan report generated by the initconfig command. The current pack-scan format does not include error, auth.name, and auth.username fields that are helpful when troubleshooting. The other fields are added to get additional visibility into all fields Rho can collect.
• replaced some key dmidecode commands that used switches not available on older versions of RHEL with commands that work on all versions of RHEL.
• added check for QEMU in manufacturer name to determine virt.type and virt.virt.

[cnsnyder]

Looks good to me. Tried it out against a few rhel machines seems to work well.