Implement delete_versioned_model API (#602)

[jacekwachowiak]

• Implement delete_versioned_model API

• Remove the specified versions of the specified models from Clipper internal.

• Implemented unregister_versioned_models Clipper API in clipper_admin.

Description

unregister_versioned_models(model_versions_dict)

Parameters

model_versions_dict : dict(str, list(str))
For each entry in the dict, the key is a model name and the value is a list of model

Raises

:py:exc:clipper.UnconnectedException
versions. All replicas for each version of each model will be stopped.

• Implemented delete_versioned_model Management-Frontend API.

API path

POST /admin/delete_versioned_model

Request schema

const std::string DELETE_VERSIONED_MODEL_JSON_SCHEMA = R"(
{
"model_name" := string,
"model_version" := string,
}
)";

• Fix build error

• Fix unit test error

• Refactor TaskExecutor and fix bugs

• Enhance the clean-up steps about useless model container

• Add VersionedModelId to registered_containers_

• Fix threadpool's bug

• Call unregister_versioned_models() when stopped model containers

• Update clipper_admin_tests.py

• Fix TaskExecutor's bug

• Change _unregister_versioned_models API to private at clipper_admin

• Add three unittests to management_frontend_tests

• TestDeleteVersionedModelCorrect

• TestDeleteVersionedModelMissingField

• TestDeleteVersionedModelForNonexistentModel

• Fix build errors

• Add one unittest to management_frontend_tests

• TestDeleteVersionedModelForInvalidModel

• Fix TestDeleteVersionedModelCorrect unittest

• Fix build error

• Fix build error