Is there a standarized way to validate configuration?

[alexppg]

Is your feature request related to a problem? Please describe.
It would be useful that before trying to start a MS, pyms checks that the configuration is using is valid. I understand that in here

pyms/pyms/config/conf.py

Line 51 in 1fb46ce

def validate_conf(*args, **kwargs):

there's some kind of validation. But it seems on high level, it doesn't validate per service, for example.

Describe the solution you'd like
I'd like that every service states clearly its configuration schema and that this can be validated at when starting the microservice.

[alexppg]

@avara1986 Hey, would it be interesting this feature using https://github.com/keleshev/schema? It seems pretty interesting. This way, the configuration that a service (or whatever) supports would be explicit, right now it's kind of implicit or to see it, you have to go to inspect the service's code.

[alexppg]

Also, not sure if related to this, but I think there should be a general way to set some sane defaults for all modules.