Add configuration IgnoreFiles for package config files. So users can rely on this to skip license conflict for some generated files. Cc: Liming Gao <liming.gao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Guomin Jiang <guomin.jiang@intel.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>