pmconfig.py: metrics names are case sensitive
pmconfig.py: metrics names are case sensitive

Fix the case when mem.util.hugepagesFreeBytes is read from pmrep.conf.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp