Updated HLTTau validation to include legs X in tau+X triggers

[slehti]

Updated the PR #9928 with a bugfix.

[cmsbuild]

A new Pull Request was created by @slehti for CMSSW_7_6_X.

Updated HLTTau validation to include legs X in tau+X triggers

It involves the following packages:

DQMOffline/Trigger

@cmsbuild, @danduggan, @deguio can you please review it and eventually sign? Thanks.
@rociovilar, @trocino, @jhgoh, @battibass 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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