procd: switch buttons to the new "button" hotplug handler
This allows requesting "timeout" ACTION in script by returning a positive value. Signed-off-by:Rafał Miłecki <zajec5@gmail.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46580 3c298f89-4303-0410-b956-a3cf2f4a3e73
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