Using ALSA DMIX plugin on an OpenSSI cluster

If you want to use ALSA in an OpenSSI cluster you may run across the 
problem that the "DMIX" plugin - software mixer - uses a fixed semaphore 
ID, which can cause conflicts between different nodes.

My quick and dirty fix is to:

1. move the /usr/share/alsa/alsa.conf file to one side:

    mv /usr/share/alsa/alsa.conf /usr/share/alsa/alsa.conf-openssi
      

(on a Debian system a better way to do this is:

    dpkg-divert --local --rename --divert /usr/share/alsa/alsa.conf-openssi /usr/share/alsa/alsa.conf
      

)

2. Make a new alsa.conf:

    # cat <<'EOF' > /usr/share/alsa/alsa.conf
    </usr/share/alsa/alsa.conf-openssi>
    defaults.pcm.!ipc_key 5678293
    EOF
      

3, make this a node-specific file:

    # mklocalfile /usr/share/alsa/alsa.conf
      

4. edit the /cluster/nodeXX/usr/share/alsa/alsa.conf files so the 
"ipc_key" is unique per node.  Prefix it with the node number for example.


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