[Run2_2017] Pileup dataset checking for get_mcm.py

Alexx Perloff requested to merge github/fork/aperloff/updateGetMcM into Run2_2017

Created by: aperloff

Update get_mcm.py to find and print the validity of the pileup dataset. If the pu dataset is incorrect the dataset is added to the unfinished cartegory and a notation is made. This commit also adds some additional samples to the default get_mcm dictionary.

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