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XRootD 4.8.2 Update, 1.0 branch (2018.04.20.)

Attila Krasznahorkay requested to merge akraszna/atlasexternals:XRootDUpdate-1.0-20180419 into 1.0

This is to fix the issue that showed up on the grid, with xrootd 4.7.0 not being able to read files from older dCache servers correctly.

Added XRootD to the AthAnalysisExternals build as well, overriding the version coming from LCG(_93). Had to make the XRootD configuration a bit smarter to get a correct build on top of an LCG release.

Tested that I could open files from EOS with the updated version of AnalysisBaseExternals and AthAnalysisExternals. It was @elmsheus who tested that this version of xrootd would be able to read files correctly from the problematic dCache version(s) as well.

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