qemu: remove chardevStdioLogd param from vhostuser code path
qemu: remove chardevStdioLogd param from vhostuser code path

The vhostuser network backend is only supported with the UNIX domain
socket chardev backend, so passing around chardevStdioLogd is not
required.

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

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