Adding this feature will allow users to easily attach a hostdev network
interface using PCI passthrough.
The interface can be attached using --type=hostdev and PCI address or
as --source. This command also allows you to tell, whether the interface
should be managed.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=997561
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>