[Lua] Generator puts whole url in basePath

Description

Generated code:

local function new_authentication_api(host, basePath, schemes)
	local schemes_map = {}
	for _,v in ipairs(schemes) do
		schemes_map[v] = v
	end
	local default_scheme = schemes_map.https or schemes_map.http
	return setmetatable({
		host = host;
		basePath = basePath or "https://tapi.telstra.com/v2";
		schemes = schemes_map;
		default_scheme = default_scheme;
		http_username = nil;
		http_password = nil;
		api_key = {};
		access_token = nil;
	}, authentication_api_mt)
end

This is using the whole base url for basePath; which is meant to be just the path.
host and schemes are missing defaults.

Swagger-codegen version

d58835e

Swagger declaration file content or url

https://raw.githubusercontent.com/telstra/MessagingAPI-v2/master/docs/swagger/messaging-api-swagger.yaml

Command line used for generation

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -l lua -i https://raw.githubusercontent.com/telstra/MessagingAPI-v2/master/docs/swagger/messaging-api-swagger.yaml -o /tmp/tmp.YLECoRioDm

Suggest a fix/enhancement

Could either break down the default target to host+scheme+path. Or change the call to new_from_uri to just take the uri as a string (instead of as broken-down table).

Reproduce the Lua generation with the provided Swagger declaration and command, then inspect the generated new_authentication_api constructor and the new_from_uri call mentioned in the issue. The fix is done when the default URL is represented with separate scheme, host, and path values, and host and schemes receive defaults without putting the full URL in basePath.