Minos-apigateway

* Add authorization rules to administration section.
* Authorization rules CRUD.
* Authorization checking on microservice call.

* Administration section BugFix getting index file.

* Administration section BugFix getting index file.
* Adjust default auth routes

* Integration with `minos-auth`.
* Add PostgreSQL database with SQLAlchemy dependency.
* Auth Rules for authentication.
* Administration section for rules management.

* Fix bug related with byte-encoded requests forwarding.

* Enforce Authentication Service validation if enabled.
* Improve error messages and use more appropriate status codes.