* increase nb for NSG code coverage
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* test more APIs in test_annoy
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* disable get_vector_by_id and search_by_id
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* improve code coverage
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* improve code coverage
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* update unittest
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* install test_instructionset
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>

* update changelog
Signed-off-by: Nyudong.cai <yudong.cai@zilliz.com>