Set tar header format to tar.FormatGNU

[StefanScherer]

With Golang 1.10 a problem with macOS tar (bsdtar using libarchive) occured listing huge files as zero byte files. After some investigation in golang/go#24599 we got some work around to set the tar header format explicitly to FormatGNU. Such tar files can be read and extracted with macOS tar.

Closes #5990

[dsnet]

FYI, doing this will cause the minimal version of Go to be Go1.10 since tar.Header.Format was only added in that version. The alternative is to place this behind a build tag.

[mwhooker]

thanks again for all the investigatory work and for this patch!

[StefanScherer]

Thanks @dsnet for your quick help.
That's why Travis errors out in the matrix build.

[ghost]

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