procd: add a 10 second delay to the interface triggers

this is an ugly hack that will be removed when the netifd maintainers
have time to look at the problem.

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45876 3c298f89-4303-0410-b956-a3cf2f4a3e73