* Make TabbedMetricsTable in charge of fetching timeseries
All of the parent components in charge of fetching timeseries data
don't actually use them, but pass them to this table. It would simplify
a lot of the parents if this component handled the ts fetching too.
This introduces a urlsForResource helper in ApiHelpers to allow
us to consolidate url generating in the app to one place. It also
associates the appropriate groupBy for various fetches.
Signed-off-by: Risha Mars <mars@buoyant.io>