Merge branch 'time-independent-prometheus-metrics' of https://github.com/arthurdandrea/grafana into arthurdandrea-time-independent-prometheus-metrics

fix(dashboard): minor function name fixes, removed insert row above/below because it did not work, #2909

Added move row to top and bottom and insert row capability.

Use dateMath in ScriptedDashboard

Added OpenSuse documentation

Fix small typo in docs for InfluxDB (influxdb.md)

Typo fix

Using the "/api/v1/query" endpoint to extract information about metrics
and labels are limited to the metrics available at the time parameter
(that is set to current time), this can lead to labels not showing
because they have no value in the current time even when the dashboard
is displaying historic data.

On the other hand "/api/v1/series" returns results including every
metric and label known to Prometheus, independent of time and value.

Fixed 3014

"No limit" was not effective for ES terms aggregation

Fix LimitNOFILE in RPM systemd unit

Fix LimitNOFILE in Debian systemd unit

This may belong to #2827

fix(elasticsearch): minor fix to elasticsearch unit tests so that they work in any timezone, fixes #3010

Ability to set a low limit for Elasticsearch date histogram interval

fix(solo panel): fixed solo panel view gray bottom for rendered image and embedd iframe scenarios, fixes #3004

fix appending query strings in linkSrv