Use internal network-scripts function net_log() instead of
/usr/bin/logger if possible to make code more consistent and cleaner.

Adding rfkill switch status into rwtab.

Fixes issue when updatedb does not have the ability to update the mlocate.db

Some versions of grep (like busybox's) do not support --quiet.
So use -q instead like in the rest of the file.

Signed-off-by: Chaitanya Vadrevu <chaitanya.vadrevu@ni.com>