Fixes #8187

Fixes #8872. Use the automatic calculation by Flot to get the
number of decimal places for ticks on the y-axis rather than
the number of decimal places for the min value.

in the prefix or postfix fields and when adding a gauge.
Previously the template variable substition was only done
when not rendering the gauge.

Merge branch 'aws-instance-attribute-tags' of https://github.com/paco3346/grafana into paco3346-aws-instance-attribute-tags

* support 1 second resolution Custom Metrics

* upgrade to aws-sdk-go v1.10.18

* simplify period calculation

* add test

* fix period calculation bug

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.