Zabbix

.......PS. [ZBX-10892] Fixed web monitoring reporting 0 for unresponsive servers

In case, during a web monitoring step, the remote server become unresponsive,
do not collect data at all. In this way all the averages (response time, download
speed and error code) will be correct.
Also, removed some dead code.

[svn merge ^/branches/3.2 -c 65745]