Clean go module cache into devcontainer

Signed-off-by: Nquicksilver <zhifeng.zhang@zilliz.com>

build/docker/env/cpu/ubuntu18.04/Dockerfile

@@ -46,6 +46,7 @@ RUN mkdir -p /usr/local/go && wget -qO- "https://golang.org/dl/go1.15.2.linux-am
     go get -v github.com/uudashr/gopkgs/v2/cmd/gopkgs && \
     go get -v github.com/go-delve/delve/cmd/dlv && \
     go get -v honnef.co/go/tools/cmd/staticcheck && \
+    go clean --modcache && \
     chmod -R 777 "$GOPATH" && chmod -R a+w $(go env GOTOOLDIR)
 
 RUN apt-get update && apt-get install -y --no-install-recommends \

tests/python_test/requirements.txt

@@ -12,4 +12,4 @@ pytest-level==0.1.1
 pytest-xdist==2.2.1
 pymilvus-distributed==0.0.48
 pytest-rerunfailures==9.1.1
-git+https://gitee.com/quicksilver/pytest-tags.git
+git+https://github.com/Projectplace/pytest-tags