Zabbix

........S. [ZBX-4976] improved {HOST.CONN}, {HOST.IP} and {HOST.DNS} macros substitution for global scripts

Before this change:
   - macros are replaced with values from the host's main "Zabbix agent" interface
   - macros are replaced with *UNKNOWN* if such interface isn't present

After this change:
   - macros are replaced with values from the host's main interfaces in the order:
        - "Zabbix agent" interface
        - SNMP interface
        - JMX interface
        - IPMI interface
   - macros are replaced with *UNKNOWN* if such interfaces aren't present