virnetdev: Check for root in virNetDevGetFeatures
virnetdev: Check for root in virNetDevGetFeatures

Since the SIOCETHTOOL ioctl only works for privileged daemons, if called
when not root, then virNetDevGetFeatures will VIR_DEBUG a message and
return 0 as if the functions were not available for the architecture.
This effectively returns an empty bitmap indicating no features available.

Introduced by commit id 'c9027d8f4'

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

taget/libvirt,fabianfreyer/libvirt,rlaager/libvirt,rlaager/libvirt,jardasgit/libvirt,zippy2/libvirt,datto/libvirt,eskultety/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,taget/libvirt,datto/libvirt,fabianfreyer/libvirt,taget/libvirt,nertpinx/libvirt,nertpinx/libvirt,andreabolognani/libvirt,libvirt/libvirt,andreabolognani/libvirt,eskultety/libvirt,taget/libvirt,taget/libvirt,libvirt/libvirt,eskultety/libvirt,fabianfreyer/libvirt,olafhering/libvirt,datto/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,jfehlig/libvirt,olafhering/libvirt,crobinso/libvirt,jardasgit/libvirt,rlaager/libvirt,nertpinx/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,crobinso/libvirt,rlaager/libvirt,andreabolognani/libvirt,rlaager/libvirt,nertpinx/libvirt,zippy2/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,crobinso/libvirt,jardasgit/libvirt,olafhering/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,datto/libvirt,eskultety/libvirt,nertpinx/libvirt,libvirt/libvirt,libvirt/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jfehlig/libvirt,olafhering/libvirt,datto/libvirt,jfehlig/libvirt