all: replace ioutil.ReadDir

[12ya]

buildutil: replace depreacted io/ioutil,
create separate function for retrieving file info from the path, export the func

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Alan Donovan:

Patch Set 1: Hold+1

(1 comment)

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[gopherbot]

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[gopherbot]

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[gopherbot]

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