Fixed checksum upload validation when compressing LHE files

[davidsheffield]

Script only gets the checksum of the files being added to EOS.
When compressing LHE files with the previous behavior, the script added a checksum for both the original .lhe file and the compressed .lhe.xz. Therefore, it would not compare the correct checksum to the file in EOS and and always produce a warning if the compression option was used.

Previously it checked:
eos/file1.lhe.xz <-> local/file1.lhe
eos/file2.lhe.xz <-> local/file1.lhe.xz
eos/file3.lhe.xz <-> local/file2.lhe
eos/file4.lhe.xz <-> local/file2.lhe.xz
etc.

Now it checks
eos/file1.lhe.xz <-> local/file1.lhe.xz
eos/file2.lhe.xz <-> local/file2.lhe.xz
eos/file3.lhe.xz <-> local/file3.lhe.xz
eos/file4.lhe.xz <-> local/file4.lhe.xz
etc.

[cmsbuild]

A new Pull Request was created by @davidsheffield (David Sheffield) for CMSSW_7_5_X.

Fixed checksum upload validation when compressing LHE files

It involves the following packages:

GeneratorInterface/LHEInterface

@vciulli, @cmsbuild, @covarell, @bendavid, @thuer can you please review it and eventually sign? Thanks.
@mkirsano this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[covarell]

-1
This should be done in 8_0_X