[Bug 1088720] [NEW] facter virtual runs lspci unconditionally

[James Troup]

Public bug reported:

'facter virtual' runs 'lspci' unconditionally on physical machines.
This causes warning spew on machines without PCI, e.g. arm.

| root at jenipapo:~# facter virtual
| pcilib: Cannot open /proc/bus/pci
| lspci: Cannot find any working access method.
| physical
| root at jenipapo:~# 

Attached is the patch we've used to fix this locally, but it's
probably not suitable for upstream as it assumes Linux.

** Affects: facter (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Check for /proc/bus/pci/devices before running lspci"
   https://bugs.launchpad.net/bugs/1088720/+attachment/3456648/+files/diff.txt

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Title:
  facter virtual runs lspci unconditionally

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