…status line.

Before this change upstream health check module reported statuses of all
resolved backends ip addresses for the specified fqdn and rendered each backend
into a one or more resolved ip addresses. In this change:
- Change html and json to report cumulative status for each fqdn;
- Fqdn specified backend considered to be up if all of the ip addresses are up;
- Display only upstream name, fqdn and health status. Miss check type, risa and
  fail count and port fields;