conf: Enable cold-plug of a mediated device
conf: Enable cold-plug of a mediated device

This merely introduces virDomainHostdevMatchSubsysMediatedDev method that
is supposed to check whether device being cold-plugged does not already
exist in the domain configuration.

Signed-off-by: Erik Skultety <2c14d38fa47c8799f1b9c16280abe27f8edfec6e@redhat.com>

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