* Added LKM lookup, showing the kernel module name to which the hook belongs to.
 * If the module is part of the kernel text, it also resolves the symbol to that specific address. It is showed between square brackets, ie: [selinux_ipv4_forward]
 * All kernel exisiting protocols were added (unless until kernel v4.20). It now allows to identify for instance IPv6, ARP, BRIDGE (ebtables), etc.
 * Fixed wrong number of hooks and protos. Removed hardcoded sizes.
 * Added function to the Linux common API to find LKM module addresses, similar to the one in mac implementation but it also resolve kernel symbols.

- Added support for every single Netfilter implementation in every single kernel version so far (v2.6ish to v5.0-rc2).
- It gathers Netfilter hook information for all existing protocol families: IPV4, IPv6, ARP, BRIDGE, DECNET and INGRESS hooks.
- Two new columns were added to the output report, the network namespace id and the module name or symbol name to which the hook address belongs to, allowing us to easily identify suspicious kernel modules using network hooks.
- If a module is part of the kernel text, it also resolves the symbol to that specific address which is showed between square brackets, ie: [selinux_ipv4_forward]
- Added function to the Linux common API to find LKM module addresses, similar to the one in mac implementation but it also resolve kernel symbols.

    - Converted unnecesary class methods to instance methods.
    - Improved docstrings documentation for some of the class methods plus an explanation how the callbacks work.

…d it could be calculated at that point using the protocol index.

- Using the same argument name for "hook_container" in get_hook_ops method. It's reassigned to a more meanful variable name in every callback.

Instead, the specific pointer to nf_hook_entries is calculated.