transientVector_ must be declared transient

[wmtan]

This is a fix for a bugs in DataFormats/TauReco/src/classes_def_3.xml, which is fatal in our ROOT6 branch. ROOT 5 still works because it has looser checking for these things,
The data member "transientVector_" of the AssociationVector template is transient, but this dictionary fails to declare it as transient for some AssociationVector template instances.
This fix will fix a failure in 22 ROOT 6 relvals.

[cmsbuild]

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

transientVector_ must be declared transient

It involves the following packages:

DataFormats/TauReco

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