* Explore: Remove datasource testing on selector
- datasource testing gets in the way of fast query iteration: switching
between datasources can take seconds
- it should not be explore's duty to test datasources in the first place
- removed the concept of datasourceError in Explore, should not be its
concern
- datasource erorrs will express themselves in query errors just fine
- connection errors are still bubbled up
- removed reconnection logic from explore, should not be its concern
- missing labels in loki are still "visible" via an empty label selector
- Loki and Prometheus treated connection errors differently than other
datasources, making sure to pass through the original error message
* Show datasource error in query field for prom/loki/influx
* Removed connection test case, fixed disabled state
* Basic components for HTTP settings migration WIP
* Add secureJsonFields to DataSourceSettings
* Introduce datasource-http-settings-next directive for backward compatibility
* fix lint
* renames
* rename fix
* TagsInput component
* move tags from app to grafana/ui
* implement tagsinput on datasourcesettings
* capitalize
* new file for react directive for testing
* some layout touch ups
* FormField story
* Minor touch ups
* add url validation
* using prevent default to prevent updating datasource when adding tag
* using Stylefactory and fix tslint issue on MouseEvent
* only show tlsauthsettings if tls or ca cert
* fix url input length
* fix for showAccessOptions
* Implemented CertTextArea, removed commented code
* removed commented / not used code
* Rename and add more elements to Certification component
* fixing newSecureJsonData
* spelling
* Fix issue with checkboxes being undefined
* Removed old partials and minor fix
* removed unused props from story
* WIP: Initial hardcoded version
* Feature: Introduces SearchFiltering to Graphite
* Feature: Adds searchFiltering to MySql
* Tests: Adds tests to Graphite and MySql
* Feature: Adds $__searchFilter to TestData
* Refactor: Adds searchFilter to Postgres and extracts function
* Tests: Adds tests to variable
* Refactor: Adds debounce and lodash import optimization
* Docs: Adds documentation
* Refactor: Removes unused function and fixes typo
* Docs: Updates docs
* Fixed issue with UI not updating when no was used due to async func and no .apply in the non lazy path
* Feature: Adds connectWithCleanup HOC
* Refactor: Small typings
* Refactor: Makes UseEffect run on Mount and UnMount only
* Refactor: Adds tests and rootReducer
* Refactor: Fixes adding of reducers on startup
* Feature: Adds connectWithCleanup HOC
* Refactor: Small typings
* Refactor: Makes UseEffect run on Mount and UnMount only
* Refactor: Adds tests and rootReducer
* Loading states and partial rendering, set loading state in mixed data source, and do not render loading states for react panels
* Updated mixed data source tests
* Explore: Take root_url setting into account when redirecting from dashboard to explore
* Explore: Move adding of subath to getExploreUrl function
* Explore: Fix explore redirect for key bindings
