snmp PMDA - add snmp.conf to the source inventory
snmp PMDA - add snmp.conf to the source inventory

Fixes a Makepkgs failure.

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