.......PS. [ZBX-8538] added Net-SNMP retry of 1 for cases where Zabbix will not be retrying itself
.......PS. [ZBX-8538] changed the strategy to decrease the optimal number of variables two times only


git-svn-id: svn://svn.zabbix.com/trunk@50195 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2