qemu: Provide a much clearer message on device hot-plug
qemu: Provide a much clearer message on device hot-plug

Adjust the current message to make it clear, that it is the hotplug
operation that is unsupported with the given host device type.

https://bugzilla.redhat.com/show_bug.cgi?id=1450072

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

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