New Plugin notify_snmp: send notifications as snmp traps.
Fix conversion cdtime to timestamp
Fix oid to free in notify_snmp_free_oids
Delete spaces
Add missing snmp_free_pdu
Check if malloc fails.
snmp_free_pdu is not needed after a successful call to snmp_sess_send
Hack to not send notif for plugins 'top' and 'sysconfig'
Merge branch 'backport/notify_snmp' into release/5.4.0

Conflicts:
	configure.in
	src/collectd.conf.pod