parallels: fix crash in prlsdkAddNet in case of CT definition
parallels: fix crash in prlsdkAddNet in case of CT definition

Since net->model is not defined for containers we shouldn't touch it.
In case network adapter model is defined, a warning about ignoring
it is shown.

Signed-off-by: Maxim Nestratov <3521c777060d1ad4ae08bba7eb9d80264eaeb236@parallels.com>

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