[Issue 20970] New: Test Suite Azure Pipelines Windows_LDC_Debug x64-debug-ldc failed due to heisenbug

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20970

          Issue ID: 20970
           Summary: Test Suite Azure Pipelines Windows_LDC_Debug
                    x64-debug-ldc failed due to heisenbug
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

Here's what the log ends with:

----
+ download
http://downloads.dlang.org/releases/2.x/2.090.0/dmd.2.090.0.windows.7z dmd2.7z
+ local
url=http://downloads.dlang.org/releases/2.x/2.090.0/dmd.2.090.0.windows.7z
+ local path=dmd2.7z
+ curl -fsSL -A 'DMD-CI curl 7.70.0 (x86_64-w64-mingw32) libcurl/7.70.0
OpenSSL/1.1.1g (Schannel) zlib/1.2.11 libidn2/2.3.0 libssh2/1.9.0
nghttp2/1.40.0' --connect-timeout 5 --speed-time 30 --speed-limit 1024 --retry
5 --retry-delay 5
http://downloads.dlang.org/releases/2.x/2.090.0/dmd.2.090.0.windows.7z -o
dmd2.7z
curl: (56) Recv failure: Connection was reset
##[error]Cmd.exe exited with code '56'.
Finishing: Download requires binaries
----

What should happen is when a network error like this happens that has nothing
to do with dmd failing the tests, is the test should sleep for a minute then
try again.

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