rhel 7、8/ ol 7、8 移除virbr0虚拟网卡

rhel 7、8/ol 7、8 新部署完系统默认会生成一个virbr0 虚拟网卡，移除方式如下:

ifconfig virbr0 down
brctl delbr virbr0
nmcli device delete virbr0-nic
systemctl mask libvirtd.service --注销
systemctl disable libvirtd.service--停用