Filter allocation metrics from statsd metrics

[jshaw86]

We would like to have a parameter to toggle off the live allocation metrics and just emit node level metrics to statsd.

Our use case for this is to leverage librato for capacity planning and sending all allocation metrics to librato is costly.

In the future we may like to target specific allocations to emit allocation level metrics out of on a on-demand basis but we could use the command line for those specific cases.

[diptanu]

@dadgar had a good idea about making this prefix matched so that the client can publish allocation metrics for certain jobs.

[jshaw86]

@diptanu @dadgar yea i think that would work fine.

[diptanu]

@jshaw86 For now we have added the tunables publish_allocation_metrics and publish_node_metrics which will allow you to turn on/off this feature. Nomad Enterprise will support turning off/on metrics for individual or a group of Jobs.

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