mapcache_seed: try to kill still running threads after grace period #313
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On rare occasions a seeding thread might be stuck (e.g. deadlocked). In a such case seeder process can not finish at all as it would wait for thread to complete forever.
This PR waits for the thread to finish ten times with increasing waiting time till 55 seconds in total have passed and then proceeds to terminate all remaining threads.
Questions to discuss: