change all grafana dashboards timezone to default

[jolson490]

Have all the dashboards use the local browser default timezone - not UTC.

Resolves the comments on the following issue about setting the timezone for the grafana web ui: https://github.com/coreos/prometheus-operator/issues/1807

[jolson490]

Note that I found the following:

https://github.com/grafana/grafonnet-lib/blob/master/grafonnet/dashboard.libsonnet

timezone='browser',
...
timezone: timezone,

https://github.com/grafana/jsonnet-libs/blob/master/grafana-builder/grafana.libsonnet

timezone: 'utc',

cc @brancz

[brancz]

I think we should use the "default" setting for timezone, which uses whatever is configured globally in Grafana (instead of the browsers default timezone or UTC hardcoded into the dashboards).

[jolson490]

And with kube-prometheus can you please tell me if there's a way to specify/change the globally configured timezone in grafana?
I'm trying to understand all the pieces that would be required for the ultimate result of being able to have dashboards use the local timezone.

[brancz]

I think that's more a question for Grafana people to answer, the jsonnet Grafana files allow setting arbitrary config, but I don't know how/where to set it in the config.