Update Class Versions of classes impacted by ROOT 6

[wmtan]

This pull request fixes most (perhaps all) ROOT6 relval errors of the form:

The StreamerInfo of class MyClass read from file MyFIle.root has the same version (=10) as the active class but a different checksum.

The classes in question have different checksums in ROOT 5 and ROOT 6 for valid reasons.
This pull request updates the version numbers for these classes. Because edmClassVersion is currently disabled in ROOT6, it is non-trivial to get the checksums for ROOT6 and guarantee that they are correct.. Therefore, "999999999" is used as a placeholder for the checksum in the ROOT6 version. When edmCheckClassVersion is turned back on, each instance of "999999999" can then be easily changed to the correct checksum.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_1_ROOT6_X.

Update Class Versions of classes impacted by ROOT 6

It involves the following packages:

DataFormats/BeamSpot
DataFormats/Candidate
DataFormats/GsfTrackReco
DataFormats/JetReco
DataFormats/MuonReco
DataFormats/TrackReco

@nclopezo, @monttj, @cmsbuild, @anton-a, @thspeer, @slava77, @vadler, @Degano can you please review it and eventually sign? Thanks.
@TaiSakuma, @nhanvtran, @bachtis this is something you requested to watch as well.
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