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Use `cirrusci/windowsservercore:2016` container for CI (#18202)

* Use `cirrusci/windowsservercore:2016` container for CI

with 4 CPUs

* Removed `Dockerfile.windows`
F
Fedor Korotkov committed
67b5ed4aee5babacfb329767dc64d263e2cead4b
Parent: 79dec6f
Committed by Yegor <yjbanov@google.com> on 6/6/2018, 3:43:13 PM