caching

[jxsl13]

It must be possible to remove all cached keys.

Question is, do we want to handle whitelists via caching or via the ip ranges goripr.Remove function?

first idea is to handle the caching via a c_t prefix where c stands for cache and t stands for temporary.

redis does only support the expiration of root level keys (without using lua scripting) forcing the cache to live in the same namespace as the ip range attributes.