Renaming set_numa_nodes() and numa_init_func() to parse_numa_opts() and
parse_numa() makes the purpose of those functions clearer.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>