Grains 信息导出时，如果ipv4列存在多个IP地址，会导致导出后的信息不一致 #22
Description
ipv4 | os | osrelease | cpu | cpu_model
10.252.70.201 | 127.0.0.1 | 172.17.0.1 | CentOS | 7.6.1810
10.252.95.53 | 127.0.0.1 | CentOS | 6.5 | 8
10.252.95.54 | 127.0.0.1 | CentOS | 6.5 | 8
10.252.95.65 | 10.252.95.85 | 127.0.0.1 | CentOS | 6.5
10.252.95.66 | 127.0.0.1 | CentOS | 6.5 | 8
10.252.95.51 | 127.0.0.1 | CentOS | 6.5 | 8