[AWS] Stat file before downloading it when doing binary cache lookup. #568
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Currently when downloading file while doing binary caching lookup fails with an error because there is a cache miss, msbuild interprets this as an error and fails the build step. Also, this adds a fatal error message in the log that is usually not ok because cache miss is a normal and expected situation.
This PR adds a stat operation before actual file download on cache lookup to eliminate fatal error and prettify log a little.
Signed-off-by: Vitalii Koshura [email protected]