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When a server relies on a SRV resolution, a task is created to clean it up (fqdn/port and address) when the SRV resolution is considered as outdated (based on the resolvers 'timeout' value). It is only possible if the server inherits outdated info from a state file and is no longer selected to be attached to a SRV item. Note that most of time, a server is attached to a SRV item. Thus when the item becomes obsolete, the server is cleaned up. It is important to have such task to be sure the server will be free again to have a chance to be resolved again with fresh information. Of course, this patch is a workaround to solve a design issue. But there is no other obvious way to fix it without rewritting all the resolvers part. And it must be backportable. This patch relies on following commits: * MINOR: resolvers: Clean server in a dedicated function when removing a SRV item * MINOR: resolvers: Remove server from named_servers tree when removing a SRV item All the series must be backported as far as 2.2 after some observation period. Backports to 2.0 and 1.8 must be evaluated.