Zabbix

...G...... [ZBXNEXT-8330] added default support to plugins for Zabbix agent 2

* commit '0ae8673567c357358b0fd46b3bb32c12af4a5f47':
  ...G...... [ZBXNEXT-8330] fixed metrics with connection parameters with non-empty hardcoded values
  ...G...... [ZBXNEXT-8330] added missing config defaults
  ...G...... [ZBXNEXT-8330] fixed issue with connection parameters without hard-coded vales and added config defaults
  ...G...... [ZBXNEXT-8330] fixed defaults and added unit test to eval params
  .......... [ZBXNEXT-8330] fixed defaults to work with hardcoded values if parameter left empty
  ...G...... [ZBXNEXT-8330] code clean up
  .......... [ZBXNEXT-8330] updated defaults to be session only
  .......... [ZBXNEXT-8330] added change log
  ...G...... [ZBXNEXT-8330] added default support to plugins for Zabbix agent 2