Zabbix

...G...... [DEV-1451] added services related metric support to agent2 on windows

* commit '91a161c515b0fd09cd6264d2d071327cc8544e7f':
  .......... [DEV-1451] fixed metric testing plugin start/stop changes on windows
  .......... [DEV-1451] improved services retrieval to have only one handle open at a time
  .......... [DEV-1451] fixed handling of empty state parameter
  .......... [DEV-1451] fixed handling of empty state parameter
  .......... [DEV-1451] fixed services metric not to contain carriage returns
  .......... [DEV-1451] removed deprecated service_state metric
  .......... [DEV-1451] added service_state, services metric support
  .......... [DEV-1451] added service.info metric support
  .......... [DEV-1451] added service.discovery metric support