Ignore a cache

= The server API is bugged for ignored caches.
= This PR contains the fix in the server and the backport.

From the caches list, add an action to ignore a cache

https://marvelapp.com/4e40j5f/screen/67743521

Ask for confirmation

https://marvelapp.com/4e40j5f/screen/67743522

When the cache is ignored, the name of the cache is not clickable anymore and a ignored status is added
https://marvelapp.com/4e40j5f/screen/67703165

Add a new filter to display ignored caches only
https://marvelapp.com/4e40j5f/screen/67703166