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Overall idea of netlink checking. Currnetly we check netlink policies for common detectable mistakes. First, we detect what looks like a netlink policy in our descriptions (these are structs/unions only with nlattr/nlnext/nlnetw fields). Then we find corresponding symbols (offset/size) in vmlinux using nm. Then we read elf headers and locate where these symbols are in the rodata section. Then read in the symbol data, which is an array of nla_policy structs. These structs allow to easily figure out type/size of attributes. Finally we compare our descriptions with the kernel policy description. Update #590