fix python

Signed-off-by: Sun, Xuehao <xuehao.sun@intel.com>

Author: XuehaoSun

.azure-pipelines/docker/Dockerfile.devel

@@ -19,9 +19,7 @@ FROM ubuntu:${UBUNTU_VER} as devel
 ENV LANG C.UTF-8
 
 RUN apt-get update && apt-get install -y --no-install-recommends --fix-missing \
-    python3 \
-    python3-pip \
-    python3-dev \
+    python3-full\
     autoconf \
     build-essential \
     git \
@@ -32,6 +30,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends --fix-missing \
     bc \
     vim
 
+RUN python3 -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
 RUN ln -sf $(which python3) /usr/bin/python
 
 RUN pip list