Passing opts with upload_config in luatest

[DifferentialOrange]

Cartridge test helper servers have a convenient upload_config option:

cartridge/cartridge/test-helpers/server.lua

Lines 262 to 270 in ba6a643

	--- Upload application config.
	-- @tparam string|table config - table will be encoded as yaml and posted to /admin/config.
	function Server:upload_config(config)
	checks('table', 'string|table')
	if type(config) == 'table' then
	config = yaml.encode(config)
	end
	return self:http_request('put', '/admin/config', {body = config})
	end

But it's not suited for testing invalid config. Luatest http_request method has options such as { raise = false } to not raise an error on non-200 requests. It would be convenient if I could pass options to http_request call in upload_config method.

[DifferentialOrange]

Nice one, thank you!