Shorten folders name for710pre8

This PR will shorten the name of the folders in Muons/RecoMuonsV/MultiTrack and HLT/Muon/MultiTrack to let them be displayed by the DQM Gui

## before changes:
![before_changes](https://cloud.githubusercontent.com/assets/3070676/2941702/2098c0f0-d9a9-11e3-9ff8-4094d6cb1f55.png)

## after changes
![after_changes](https://cloud.githubusercontent.com/assets/3070676/2941707/2782b98e-d9a9-11e3-8f1d-4fa0e78a618d.png)


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