fix "Cloudwatch panel does not allow arbitrary variable values in query"

Karma to Jest: history_ctrl

Pass configured/auth headers to a Datasource.

In some setups (ex openshift), the Datasource will require Grafana
to pass oauth token as header when sending queries.
Also, this PR allow to send any header which is something
Grafana currently does not support.

Conditionally select a field to return in ResponseParser for InfluxDB

Fix error in InfluxDB query

[skip ci]

build: fix signing of multiple rpm packages

[skip ci]

https://github.com/grafana/grafana-docker/issues/170
[skip ci]

[skip ci]

[skip ci]

[skip ci]

Make sure to process panels in collapsed rows when exporting dashboard

[skip ci]

graph: fix legend decimals precision calculation

[skip ci]

Fix dashboard drop down links

Fix regressions after save modal changes

expose session and transaction helpers to other services

Fix problem with adhoc variable filters not handled.
Fix problem with saving variables and time per default when saving a
dashboard as/first time.
Fix updating dashboard model after save with saving time/variables
enabled so that next time you save you won't get checkboxes for save
time/variables unless any values changed.
Tests validating correctness if time/variable values has changed.

* Karma to Jest: history_srv

* Fix TS errors

* Remove q, as it is not needed

[skip ci]

ldap: allow use of DN in group_search_filter_user_attribute and member_of

[skip ci]

* Begin Karma to Jest: time_srv

* Remove experimental fix

* location search stubs for each test

* Fix issue where time service was not available for other tests