Attempt to reset PCI device by writing to device reset file if present.
Merge pull request #1413 from siddharthv/CA-113402-TR

CA-113402: Attempt to reset PCI device by writing to device PCI file. If that fails, fallback to the old method.
CA-107600: Fix VM_appliance.shutdown for suspended domains in vApp.
Merge pull request #1352 from siddharthv/CA-107600

Fix VM_appliance.shutdown for suspended domains in vApp.