Python test (#179)

### What problem were solved in this pull request?

Issue Number: close #169 

Problem:
python测试脚本启动过于复杂；
没有利用python的case测试功能

### What is changed and how it works?
删减掉大部分python测试脚本的参数；
把basic测试用例增加到github action中

### Other information

.github/workflows/build.yml

@@ -53,3 +53,15 @@ jobs:
       shell: bash
       run: sudo bash build.sh init && bash build.sh release --make -j4
       
+  basic-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository and submodules
+        uses: actions/checkout@v2
+
+      - name: run basic test
+        shell: bash
+        run: |
+          sudo bash build.sh init
+          python3 test/case/miniob_test.py --test-cases=basic | tail -1 | grep "basic is success"

test/case/README.md

 # miniob-test
 miniob自动化功能测试
-使用方法参考 miniob_test.py
+
+运行所有测试用例：
+```bash
+python3 miniob_test.py
+```
+
+运行 basic 测试用例
+```bash
+python3 miniob_test.py --test-cases=basic
+```
+
+> 如果要运行多个测试用例，则在 --test-cases 参数中使用 ',' 分隔写多个即可
+
+更多运行方法和参数可以参考 miniob_test.py
 

test/case/case-scores.json

-{
-  "basic":{"necessary":true, "score":10},
-  "primary-date":{"necessary":true, "score":10},
-  "primary-update":{"necessary":true, "score":10},
-  "primary-select-meta":{"necessary":true, "score":10},
-  "primary-select-tables":{"necessary":true, "score":10},
-  "primary-aggregation-func":{"necessary":true, "score":10},
-  "primary-drop-table":{"necessary":true, "score":10},
-
-  "primary-insert":{"necessary":false, "score":10},
-  "primary-join-tables":{"necessary":false, "score":20},
-  "primary-null":{"necessary":false, "score":10},
-  "primary-unique":{"necessary":false, "score":10},
-  "primary-simple-sub-query":{"necessary":false, "score":10},
-  "primary-multi-index":{"necessary":false, "score":20},
-  "primary-text":{"necessary":false, "score":20},
-  "primary-expression":{"necessary":false, "score":20},
-  "primary-complex-sub-query":{"necessary":false, "score":20},
-  "primary-order-by":{"necessary":false, "score":10},
-  "primary-group-by":{"necessary":false, "score":20}
-}