mgr/volumes: remove incorrect 'size' from output of 'snapshot info' Reviewed-by: Venky Shankar <vshankar@redhat.com> Reviewed-by: Ramana Raja <rraja@redhat.com> Reviewed-by: Kotresh HR <khiremat@redhat.com> Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>