graphite: minor fix for PR #10142 the query was being sent for every segmen t you selected before you completed the metric path

Fixes bug in cloudwatch regarding credentials

[render image]add encoding param

hyphen

Wait for all sub routines to finish before closing Grafana

The datasource uses the default region in the query if the region
is "" in the settings. However setting the region to an empty string
is almost impossible and rendered incorrectly.

This commit introduces a special value "default" for region which
is shown in the drop down and is translated to the default region
of the data source when performing queries.

simple solution for waiting for all go sub routines to
finish before closing Grafana. We would use errGroup
here as well but I dont like spreading context's all
over the place.

closes #10131

Solves problem with Github authentication restriction by organization

* change $__timeGroup macro to include column alias

* update docs and help text for $__timeGroup macro

Load dashboards from disk into the database at regular interval