Add Zabbix Java Gateway ports

This update separates Java Gateway componentes from the Zabbix Server port,
creating an additional slave port for each version.

This way is possible to deploy a Java Gateway without the need to install
Zabbix Server components.

In the current state there wasn't an rcfile for the Java Gateway. [1]

PR: 217777
Reported by: Juan Garcia <juan@ish.com.au> [1]
Approved by: Pakhom Golynga <pg@pakhom.spb.ru> (maintainer)