feat: calls to Graphite api /metrics/find now include panel or dashboard time ranges in some scenarios, closes #8055

fix: png rendering api & timeout parameter now works as it should AND default render timeout increased from 30 to 60 seconds, fixes #8710

* Add new HttpGetResponse struct type
* Modify HttpGet() return to use HttpGetResponse
* Look up _all_ the teams the user is a member of

Some being user visible.

Status code now replaced with Query parameters

the example response body contained incorrect out-of-place data, presumably from a copy-paste operation

Fixes #5515. Flot gauge has its own threshold check that is different
from the threshold check in singlestat. This changes the flot check to
be exclusive (same as the singlestat check). E.g. if the threshold is
10, then the value 10 is over the threshold.

* Fix Labeling issue when hiding Queries.

Issue #8928

* Fix spacing.

* Replacing tabs with spaces.

* Fix for jshint

* heatmap: fix converting error when series contains 0 and log scale is selected, issue #8884

* heatmap: fix app crash when Y min set to 0 with log scale

* heatmap: fix tooltip for 'zero' buckets in log scale

* heatmap: fix tooltip histogram for log scales

* heatmap: fix flicker of the highlighted element

this was caused by too often fired mouseenter/mouseleave events

* heatmap: fix missing X axis option for log scales

* heatmap: fix missing zero bucket in tooltip histogram

settings(change): changed default value for allow sign up to false, closes #8743, and changed default option allow_org_create to false

Fixes #8870. Fixes out of bound exception on adding a math query part
when there is no group by interval (or only one query part).

There are three locations where the `docker run` command is referenced:
- 2x http://docs.grafana.org/installation/docker/
- 1x https://grafana.com/grafana/download?platform=docker

The fix syncs the given `docker run` command arguments with the other two.

* panel-alertlist: use dashboard timezone, fixes #8874

* alert state history: use dashboard timezone, issue #8874

* alert state history: minor refactor