WIP: wlc moved to from dataplane to controlplane

[levon-a-akopian]

No description provided.

[ol-imorozko]

Could you please improve the commit message?

Change wlc moved to from dataplane to controlplane to Move wlc from dataplane to controlplane

Also, add a short description explaining why this change is needed, please

[ol-imorozko]

We will have code duplication here with the following lines:

auto it = reals_enabled.find(key);
if (it != reals_enabled.end())
{
	if (it->second.has_value())
	{
		effective_weight = it->second.value();
	}
}

I think we can add a private method in balancer_t like

 template <typename Map>
    std::optional<typename Map::mapped_type::value_type> get_effective_weight(const Map& map, const balancer::real_key_global_t& key) const {
        auto it = map.find(key);
        if (it != map.end() && it->second.has_value()) {
            return it->second.value();
        }
        return std::nullopt;
    }

And then use it, for example, with compound initialization:

if (auto found_weight = get_effective_weight(reals_wlc_weight, key); found_weight) {
    effective_weight = *found_weight;
}

[ol-imorozko]

auto found_weight = get_effective_weight(reals_enabled, key);
uint32_t effective_weight = found_weight ? *found_weight : weight;

[ol-imorozko]

IMHO

if (it != real_connections.end())
{
    connections += it->second;
}

is cleaner, but feel free no ignore