qemu: allow coldplugging input devices
qemu: allow coldplugging input devices

https://bugzilla.redhat.com/show_bug.cgi?id=1379603

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