[ci] Fix python coverage color bar (#1692)

Signed-off-by: pettershao-ragilenetworks <pettershao@ragilenetworks.com>

azure-pipelines.yml

@@ -38,6 +38,7 @@ stages:
 
     - script: |
         set -xe
+        sudo apt-get -y purge libhiredis-dev libnl-3-dev libnl-route-3-dev
         sudo dpkg -i libnl-3-200_*.deb
         sudo dpkg -i libnl-genl-3-200_*.deb
         sudo dpkg -i libnl-route-3-200_*.deb
@@ -77,6 +78,15 @@ stages:
       workingDirectory: $(Pipeline.Workspace)/target/python-wheels/
       displayName: 'Install Python dependencies'
 
+    - script: |
+        set -ex
+        # Install .NET CORE
+        curl -sSL https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
+        sudo apt-add-repository https://packages.microsoft.com/debian/10/prod
+        sudo apt-get update
+        sudo apt-get install -y dotnet-sdk-5.0
+      displayName: "Install .NET CORE"
+
     - script: |
         python3 setup.py test
       displayName: 'Test Python 3'