virsh: tweak domif-getlink link state reporting message
virsh: tweak domif-getlink link state reporting message

According to docs, we only support 2 link states for an interface
up/down, 'up' being the default state if link state is unspecified in
domain's XML, so the message when no link state is provided should be
changed a little.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1141119

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