arptables: add the directory for default /etc/sysconfig/arptables
Solve the potential issue for previous commit
<arptables: add arptables systemd service file>: in a small build where
/etc/sysconfig directory doesn't exist, the action of adding default
configuration file (/etc/sysconfig/arptables) will fail.
Signed-off-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>