Refactoring: cleanup all the maps in configuration using Lua

[ElvinEfendi]

It's hard to wrap your head around currently in the Nginx configuration template and map is limited.

We can introduce a new Lua middleware to take care of i.e setting $best_http_host and all the other similar variables. To do that we should make sure configmap settings are synced to Lua and stored in the configuration_data shared dictionary. We can then introduce rewrite_by_lua_block phase in http section and call this new Lua middleware there.

[aledbf]

We can introduce a new Lua middleware to take care of i.e setting $best_http_host and all the other similar variables.

One of the reasons why I want a kubectl plugin for ingress-nginx is to be able to install the controller previous inspection of the cluster. This can help us to introduce the concept of “profiles” to handle the behavior of the headers. The goal is to remove the existing logic in the template, having a simple definition, also allowing the use of the definition of custom behavior

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[ElvinEfendi]

With #3798 we have converted significant number of map's to Lua rewrite code.