* Chore: remove session storage references
* Small refactoring of the settings module
* Update docs - remove references for the session storage
* Update config files (sample and default configs)
* Add tests for warning during the config load on defined storage cache
* Remove all references to session storage
* Remove macaron session dependency
* Remove leftovers
* Fix: address review comments
* Fix: remove old deps
* Fix: add skipStaticRootValidation = true to tests
* Fix: improve the docs and warning message
As per discussion in here - https://github.com/grafana/grafana/pull/16445/files#r273026255
* Chore: make linter happy
Fixes#16148
Ref #16114
