We don't offer /etc/radvd.conf but only radvd.conf.example which would
cause a startup error:
Starting radvd:
* /etc/radvd.conf does not exist or is empty.
Remove update-rc.d settings to make it doesn't start by default.
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>