ListenAnyIP_HostName_Success and RegisterAddresses_HostName_Success test failure

[BrennanConroy]

Failures I saw were all on OSX and these two tests fail together. Likely need to update the HostNameIsReachableAttribute.

System.Net.Sockets.SocketException : nodename nor servname provided, or not known
   at Microsoft.AspNetCore.Testing.HttpClientSlim.GetSocket(Uri requestUri) in /_/src/Testing/src/HttpClientSlim.cs:line 189
   at Microsoft.AspNetCore.Testing.HttpClientSlim.GetStream(Uri requestUri, Boolean validateCertificate) in /_/src/Testing/src/HttpClientSlim.cs:line 152
   at Microsoft.AspNetCore.Testing.HttpClientSlim.<>c__DisplayClass1_0.<<GetStringAsync>b__0>d.MoveNext() in /_/src/Testing/src/HttpClientSlim.cs:line 33
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Testing.HttpClientSlim.RetryRequest(Func`1 retryBlock) in /_/src/Testing/src/HttpClientSlim.cs:line 121
   at Microsoft.AspNetCore.Testing.HttpClientSlim.GetStringAsync(Uri requestUri, Boolean validateCertificate) in /_/src/Testing/src/HttpClientSlim.cs:line 31
   at Microsoft.AspNetCore.Testing.HttpClientSlim.GetStringAsync(String requestUri, Boolean validateCertificate) in /_/src/Testing/src/HttpClientSlim.cs:line 26
   at Microsoft.AspNetCore.Server.Kestrel.FunctionalTests.AddressRegistrationTests.RegisterAddresses_Success(String addressInput, String[] testUrls, Int32 testPort) in /_/src/Servers/Kestrel/test/BindTests/AddressRegistrationTests.cs:line 212
   at Microsoft.AspNetCore.Server.Kestrel.FunctionalTests.AddressRegistrationTests.RegisterAddresses_HostName_Success() in /_/src/Servers/Kestrel/test/BindTests/AddressRegistrationTests.cs:line 42
--- End of stack trace from previous location ---

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[jkotalik]

I believe this isn't an issue with the HostNameIsReachableAttribute, rather the hosting being unavailable after the check for HostNameIsReachableAttribute. I'm looking at the test history for these and the failures "Name does not resolve" (SocketError.NetworkUnreachable) and "nodename nor servname provided, or not known" (SocketError.HostNotFound) are already check for by HostNameIsReachableAttribute. It looks like the check is catching some of the failures (some tests are skipped), but it's a point in time failure so sometimes it will fail.

Few proposals:

1. Skip these entirely on macOS.
2. Add retries via a bool to HttpClientSlim (opt in)

[jkotalik]

And we already do do retries on macOS...

https://github.com/dotnet/aspnetcore/blame/main/src/Testing/src/HttpClientSlim.cs#L111

[halter73]

Transient failures and we're already retyring up to 3 times on macOS. I vote skip.