Fix/silence warnings in tau trigger DQM

Fixes/silences the warnings reported by Giulio in https://hypernews.cern.ch/HyperNews/CMS/get/swReleases/4012.html. The filter types ```HLT1Tau``` and ```HLT2MuonTau``` used in 2011 HLT menu were not recognized (an oversight by me). The other warning about "not finding any paths matching to regex" I silenced by decreasing the message level to LogInfo. We will probably anyway move in the near future to monitor all tau paths in a generic way, making this regex-path matching (and the now-LogInfo message) obsolete.

FYI @mbluj