radvd: eliminate confusing warnings when stop service
radvd: eliminate confusing warnings when stop service

When run 'service radvd stop' in case radvd is not started/running,
we'll get warnings like this:

Stopping radvd: no /usr/sbin/radvd found; none killed
/etc/init.d/radvd: warning: cannot restore settings
radvd.

We could by pass these OPs by just check if the service is running
or not so eliminate possible warnings.

Signed-off-by: Liang Li <6a6122cab31280768ed3910a5ba0f07a5b52a2fa@windriver.com>
Signed-off-by: Joe MacDonald <16a9a54ddf4259952e3c118c763138e83693d7fd@deserted.net>

WindRiver-OpenSourceLabs/meta-networking