Zabbix

.........T [ZBXNEXT-9034] added Jira Datacenter by JMX template

Merge in ZBX/zabbix from feature/ZBXNEXT-9034-6.0 to release/6.0

* commit '31b1be3d27ab4689796bf603cf30a709708feada':
  .........T [ZBXNEXT-9034] fixed mail graph in jira data center by jmx template
  .........T [ZBXNEXT-9034] fixed item name in jira data center template
  .........T [ZBXNEXT-9034] fixed changelog
  .........T [ZBXNEXT-9034] added Jira Datacenter by JMX template