Use pydantic for data validation (instead of jsonschema)

Fix/improve various pydantic shema models.

gns3server/endpoints/controller/templates.py

@@ -27,13 +27,14 @@ log = logging.getLogger(__name__)
 
 from fastapi import APIRouter, Request, Response, HTTPException, status
 from fastapi.encoders import jsonable_encoder
-from typing import Union, List
+from typing import List
 from uuid import UUID
 
 from gns3server.endpoints.schemas.common import ErrorMessage
 from gns3server.endpoints import schemas
 from gns3server.controller import Controller
 
+
 router = APIRouter()
 
 responses = {
@@ -41,11 +42,6 @@ responses = {
 }
 
 
-#template_create_models = Union[schemas.VPCSTemplateCreate, schemas.CloudTemplateCreate, schemas.IOUTemplateCreate]
-#template_update_models = Union[schemas.VPCSTemplateUpdate, schemas.CloudTemplateUpdate, schemas.IOUTemplateUpdate]
-#template_response_models = Union[schemas.VPCSTemplate, schemas.CloudTemplate, schemas.IOUTemplate]
-
-
 @router.post("/templates",
              status_code=status.HTTP_201_CREATED,
              response_model=schemas.Template)