1) Added extra attributes to the zabbix server configuration.
start_pingers with default value of 1
history_cache_size with default value of 8M
history_text_cache_size with default value of 16M
trend_cache_size with default value of 4M
2) Updated metadata.rb with minor change to 0.8.1
3) Updated the template to use the values from the zabbix server attributes.
1) Added extra attributes to the zabbix server configuration.