* Do caching of app config per instance instead of across all of them in redis
* Add changes file
* Simplify code based on review comment
* Use go-cache instead of creating our own
* Dont export consts
* Copy app config before returning it
* Fix lint
* Update go sum
* Update go sum
* Cache app config in redis
* Add changes files
* Replace string with constant
* Revert some test refactorign and duplicate a bit of test code
* Add test for AppConfig with redis failing
* Fix lint
* Use Doer so it works better in clusters
* Skip unmarshalling if we already did
* Allow to cache hosts if configured
* Omit the setting if empty
* Remove hashing, too much CPU
* Revert caching of host auth... needs a more thought through approach
* Remove config
* Remove old config
* Remove locker interface
* Fix test and address review comments
