removed IO panel, because there are no io metrics anymore and
this panel is useless;
added general grafana panel with 4 new graphs:
count of organizations,
count of users,
count of playlists,
count of dashboards.
Related-Bug: PROD-18204
Change-Id: I92034621746803ea5e744c1a055d08dd32e71a90
This patch adds a default panel that will be used when another service
will add a new panel into the main dashboard through grains. This is the
common part between all panels of the main dashboard.
It replaces the static main dashboard that has been removed.
This patch provides the main dashboard through grains. It is not the final
way to provide the main dashboard. It is more a workaround because we
don't know yet how to compose a dashboards with pieces split between
several formulas. We will probably use YAML pieces.
