refined the grep statement

rename_device no longer exists.

All networking scripts from /etc/sysconfig/network-scripts call logger without
full path. This can prevent system from booting if let's say dcc is installed
when compiled with wrong parameters and  installs /usr/sbin/logger (see bellow)
It's not really a bug but this can be easily prevented. All /etc/init.d scripts
use full path for logger network-scripts should use it also

Updated iproute doesn't like the old syntax.