Fixes bug 1307482
Previously, the SNMP reported load averages were misleadingly metered
as percentage utilizations.
Now, these samples include a meter name and unit that more accurately
reflect their true meaning - i.e. an exponentially-damped moving average
of the number of running or runnable processes.
Change-Id: I5dbc6f7886ed9a451926b502365ec80322f6b458