tag resources with corresponding metrics from heapster

[EranGabber]

If Heapster stores metrics in InfluxDB, tag the corresponding resources with the query parameters needed to access them.
If Heapster stores the metrics in GCM, tag the corresponding resources with he query parameters needed to access them.
In both cases, write sample programs to access the data using the query parameters.

[EranGabber]

The metric annotations should be concise and avoid repeated information.

[EranGabber]

This issue will be closed once we can read the actual list of available metrics from Heapster.