Add custom collectd configuration for M-Lab servers.
Add custom collectd configuration for M-Lab servers.

This adds the collectd-mlab.conf for M-lab servers. This is a
much-reduced version of the default /etc/collectd.conf with only the
plugins used by collectd-mlab. As well additional notes are included
that are particular to M-Lab's configuration.

stephen-soltesz/collectd-mlab,m-lab/collectd-mlab,m-lab/collectd-mlab,stephen-soltesz/collectd-mlab