[Improvemet] Add to healthcheck route the state of dependant services #1763
Description
Component
Feature enhancement
Is your feature request related to a problem? Please describe
Right now, /iot/about does not provides any information regarding the status of the service.
Healthechek just verifies if status code 200 is returned, but it is possible the IoTA is still waiting for the MQTT broker or the IoTA Manager.
This is specially important during the startup or after a platform reboot.
Describe the solution you'd like
I propose a JSON response offering information about dependant seriveces. I.E:
{
"mongo":"ok",
"iotamanager":"ok",
"mqtt":"nok"
}