CentOS7: bring back eth interface

In case you've installed CentOS 7, notice that there are no ethX interfaces, to bring them back:

1. Use the following command to add two parameters to the linux kernel line:

sed -i "s/quiet.*/quiet net.ifnames=0 biosdevname=0\"/" /etc/default/grub

2. Recreate the new grub configuration using the following command:

grub2-mkconfig -o /boot/grub2/grub.cfg

3. Reboot the computer.