This patch implements the signal whitelist feature. All the signal messages will be discarded if they are not existed in whitelist. Signed-off-by: Liu Yuan <yuan1.liu@intel.com> Reviewed-by: Wang Yu <yu1.wang@intel.com> Reviewed-by: Liu Shuo <shuo.a.liu@intel.com> Reviewed-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>