[BUG] Use x-forwarded-for header

[AntonioRodriguezRuiz]

Description

When accessing the ip of the request in a microservice, we expect the ip of the user, not the API Gateway

Steps to Reproduce

1. Activate a microservice and the api-gateway
2. Send a request via the api gateway to the microservice
3. Note the ip address logged in the microservice is the ip of the api-gateway

Expected Behavior

The IP of the user is forwarded

Actual Behavior

The IP of the user is not forwarded

Proposed fix

Change instances of req.ip to req.headers && req.headers['x-forwarded-for'] || req.ip