By storing render key in remote cache it will enable
image renderer to use public facing url or load
balancer url to render images and thereby remove
the requirement of image renderer having to use the
url of the originating Grafana instance when running
HA setup (multiple Grafana instances).
Fixes#17704
Ref grafana/grafana-image-renderer#91
* Add tests for login view
* Fix OAuth auto login redirect loop
login_error cookie is only set when the OAuth login fails
for some reason. Therefore, the login view should return
immediately if a login_error cookie exists before trying
to login the user using OAuth again.
* Fix test
Use 'index-template' instead of 'index' for testing
* Add some comments
This changes forks the mysql part of the Macaron session middleware.
In the forked mysql file:
- takes in a config setting for SetConnMaxLifetime (this solves wait_timeout
problem if it is set to a shorter interval than wait_timeout)
- removes the panic when an error is returned in the Exist function.
- retries the exist query once
- retries the GC query once
