Zabbix

...G...... [ZBXNEXT-6319] added systemd.unit.get key for for Zabbix agent 2

* commit 'ad92a5aa91238221c7580b7c75360697c9e45249':
  .D........ [ZBXNEXT-6319] added change log
  ...G...... [ZBXNEXT-6319] removed unneeded state parsing in systemd get for Zabbix agent 2
  ...G...... [ZBXNEXT-6319] improved error handling
  ...G...... [ZBXNEXT-6319] fixed typos
  ...G...... [ZBXNEXT-6319] reduced code size
  ...G...... [ZBXNEXT-6319] removed redundant variable
  ...G...... [ZBXNEXT-6319] improved parameter detection to give same errors as in other places
  ...G...... [ZBXNEXT-6319] fixed issue with incorrect parsing for Unit in systemd get for Zabbix agent 2
  ...G...... [ZBXNEXT-6319] changed log messages to start with a lowercase for systemd get in Zabix agent 2
  ...G...... [ZBXNEXT-6319] code clean up
  ...G...... [ZBXNEXT-6319] code clean up
  ...G...... [ZBXNEXT-6319] simplified systemd get logic for Zabbix agent 2
  ...G...... [ZBXNEXT-6319] updated systemd get support for Unit and Service for Zabbix agent 2
  ...G...... [ZBXNEXT-6319] added systemd.unit.get key for for Zabbix agent 2