WindowsRS5 CI is borked #38114
Description
For example on #38103; https://jenkins.dockerproject.org/job/Docker-PRs-WoW-RS5-Process/237/console
23:11:20 INFO: Base image for tests is microsoft/windowsservercore
23:11:20 INFO: Loading windowsservercore .tar from disk into the daemon under test. This may take some time...
23:12:08
23:12:08
23:12:08 ERROR: Failed 'ERROR: Failed to load c:\baseimages\windowsservercore.tar into daemon under test' at 10/30/2018 23:12:08
23:12:08 At C:\gopath\src\github.com\docker\docker\hack\ci\windows.ps1:705 char:21
23:12:08 + ... Throw $("ERROR: Failed to load $readBaseFrom`:\baseimages ...
23:12:08 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
These scripts were last updated in #37715, but I'm not sure if that's related, or if it's something with the machines.
ping @ddebroy @jhowardmsft @johnstep PTAL