met uncertainty tool (in PAT) fixes for 72X releases

The MET uncertainty tool in PAT has been updated accordingly to the last development changes in 72X releases, and can go to the central release now.

Pat MET names have been also updated in order to match the new naming convention.

Matthieu

They were supposed to be in the Global Tag already ( Slava pointed to this in another thread : https://hypernews.cern.ch/HyperNews/CMS/get/swReleases/4087/1/1/1/1.html) but you should check. My only concern is not to forget to change to the right one at some point (not too far from now).