Install RRD-enabled sdcollectd at all CL clusters
Now that we can collect and query idle stats via RRD files, get this capability installed on all CloudLab clusters (and Utah DDC IG).
This is blocked on #77 (closed). Once @stoller determines the idle stats querying/data is sufficient for use in making decisions for granting extensions, I will execute on this task (or iterate first on idle stats gathering/reporting).
The stats gathering will, however, be installed on the Utah CloudLab cluster (in addition to Emulab Mothership). We need to have data from one of the official clusters in addition to the Emulab Mothership.