List the branches where I queue patches for Machine Core, NUMA,
Memory Backends, and X86.  Update the NUMA section to list the
"machine-next" branch instead of "numa".

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170901153928.17058-1-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>