Use pymilvus at testing stage in master-ci-pipeline (#1346)

Signed-off-by: Nzhenwu <zw@zilliz.com>

tests/milvus_python_test/requirements.txt

@@ -7,4 +7,4 @@ allure-pytest==2.7.0
 pytest-print==0.1.2
 pytest-level==0.1.1
 scikit-learn>=0.19.1
-pymilvus-test>=0.2.0
+pymilvus>=0.2.0

tests/milvus_python_test/requirements_cluster.txt

@@ -22,4 +22,4 @@ typed-ast==1.3.5
 wcwidth==0.1.7
 wrapt==1.11.1
 zipp==0.5.1
-pymilvus>=0.1.24
+pymilvus>=0.2.0