NSS mostly knows four error cases: SUCCESS, NOTFOUND, UNAVAIL, TRYAGAIN, and they can all be used in nsswitch.conf to route requests. So far nss-resolve would return SUCCESS + NOTFOUND + UNAVAIL. Let's also return TRYAGAIN in some cases, specifically the ones where we are currntly unable to resolve a request but likely could later. i.e. errors caused by networking issues or such. Fixes: #20786
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