Use an INI parser instead of reading config by hand

[synthead]

These lines are parsing the zabbix config file by hand:

      File.open(zabbix_conf_file).each do |line|
        ## skip comments
        next if line =~ /^(\s+)?#/ 

        ## strip tail comments
        line.gsub!(/#.*/, '')

        ## zabbix splits on equals 
        key, value = line.split("=", 2)
        key.chomp!
        value.chomp!

        ## zabbix keys look like strings
        next unless key  =~ /[A-Za-z0-9]+/

        ## cool
        zabbix_conf[key] = value
      end

Use a Ruby INI parser instead.