[packages] olsrd: use system-logger instead of dumping to stdout

[packages] olsrd: use system-logger instead of dumping to stdout

packages: olsrd: use system-logger instead of dumping to stdout,
which is cleaner and also seen if not interactive called. minor
cleanups in some messages, also show function-name in messages.
by using 'logger -s' we can see the message on screen and in logs.

Signed-off-by: Bastian Bittorf <bittorf@bluebottle.com>
git-svn-id: svn://svn.openwrt.org/openwrt/packages/net/olsrd@35678 3c298f89-4303-0410-b956-a3cf2f4a3e73