Disable Superuser Request by Defualt

[1995parham]

I think we don't need superuser to be enabled by default but these default configurations cause superuser request be enabled by default acorrding the following code:

case application:get_env(?APP, super_req) of
    undefined ->
        emqx_hooks:put('client.authenticate', {emqx_auth_http, check, [#{auth => maps:from_list(AuthReq),
                                                                         super => undefined}]});
    {ok, SuperReq} ->
        PoolOpts1 = proplists:get_value(pool_opts, SuperReq),
        PoolName1 = proplists:get_value(pool_name, SuperReq),
        {ok, _} = ehttpc_sup:start_pool(PoolName1, PoolOpts1),
        emqx_hooks:put('client.authenticate', {emqx_auth_http, check, [#{auth => maps:from_list(AuthReq),
                                                                         super => maps:from_list(SuperReq)}]})
end

also by using environment variables there is no way to disable them.

[1995parham]

I think we have the same setup here but when we lunch EMQX with its chart, I think the plugin from the emq repository is used so we have timeouts because we cannot disable superuser requests.

[1995parham]

@Rory-Z sorry for mentioning you, can you please check this?