net-mgmt/zabbix3-server: 3.0.4 -> 3.0.5

• RC scripts: add zabbix_server_paths, zabbix_agentd_paths, zabbix_proxy_paths
• Fix net-snmp depends for -agent

PR: 213267
Changes: http://www.zabbix.com/rn3.0.5.php
Submitted by: Pakhom Golynga <pg@pakhom.spb.ru> (maintainer)