Remove check_event_exists function
Remove check_event_exists function

If the event requested isn't in already in papi_info, add_metric
and remove metric won't get called at all anyways, this check is
redundant

aeg-aeg/pcpfans,wuliming/pcp,wuliming/pcp,edwardt/pcp,edwardt/pcp,mbaldessari/pcp,andyvand/cygpcpfans,adfernandes/pcp,wuliming/pcp,edwardt/pcp,edwardt/pcp,tjanez/pcp,wuliming/pcp,tjanez/pcp,prasincs/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,edwardt/pcp,prasincs/pcp,aeg-aeg/pcpfans,adfernandes/pcp,aeg-aeg/pcpfans,prasincs/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,aeg-aeg/pcpfans,tjanez/pcp,adfernandes/pcp,adfernandes/pcp,edwardt/pcp,wuliming/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,adfernandes/pcp,adfernandes/pcp,tjanez/pcp,adfernandes/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,prasincs/pcp,tjanez/pcp,edwardt/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,adfernandes/pcp,tjanez/pcp,wuliming/pcp,tjanez/pcp,prasincs/pcp,andyvand/cygpcpfans,mbaldessari/pcp,wuliming/pcp,wuliming/pcp,prasincs/pcp,andyvand/cygpcpfans,prasincs/pcp,edwardt/pcp,tjanez/pcp,mbaldessari/pcp,prasincs/pcp