Virtual Power Driver list running vms quoting error

This patch corrects a issue with VPD when configured for virsh the
list running vms function attempts to execute $2 instead of the actual
command.

Fixes Bug 1154280

Change-Id: I6d06cc58fb0f2935c4341761908b914106bda916
Authored-by: Chris Krelle <nobodycam@gmail.com>
Merge "Virtual Power Driver list running vms quoting error"