[squid-dev] [PATCH] Fix for bug 4190

[Kinkie]

Hi all,
   the attached patch is a proposed fix for bug 4190 (and then some).
It transforms the global hash_table proxy_auth_username_cache into
four per-authentication-scheme std::unordered_map-backed caches,
leveraging the RegisteredRunner API and SBuf.

Build-tested and run-tested.

Thanks to Amos for his guidance and support.

-- 
    Kinkie
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