message: fix(api): don't log db conn failures on db create/update
diff: @@ -39,6 +39,7 @@ from superset.constants import RouteMethod
  from superset.databases.commands.create import CreateDatabaseCommand
  from superset.databases.commands.delete import DeleteDatabaseCommand
  from superset.databases.commands.exceptions import (
  + DatabaseConnectionFailedError,
  DatabaseCreateFailedError,
  DatabaseDeleteDatasetsExistFailedError,
  DatabaseDeleteFailedError,
  @@ -229,6 +230,8 @@ class DatabaseRestApi(BaseSupersetModelRestApi):
  return self.response(201, id=new_model.id, result=item)
  except DatabaseInvalidError as ex:
  return self.response_422(message=ex.normalized_messages())
  + except DatabaseConnectionFailedError as ex:
  + return self.response_422(message=str(ex))
  except DatabaseCreateFailedError as ex:
  logger.error(
  "Error creating model %s: %s", self.__class__.__name__, str(ex)
  @@ -300,6 +303,8 @@ class DatabaseRestApi(BaseSupersetModelRestApi):
  return self.response_404()
  except DatabaseInvalidError as ex:
  return self.response_422(message=ex.normalized_messages())
  + except DatabaseConnectionFailedError as ex:
  + return self.response_422(message=str(ex))
  except DatabaseUpdateFailedError as ex:
  logger.error(
  "Error updating model %s: %s", self.__class__.__name__, str(ex)
  