workflow: add ccnp test dependency for pylint

Signed-off-by: Xiaocheng Dong <[email protected]>

Author: dongx1x

.github/workflows/pr-pylint.yaml

@@ -26,6 +26,7 @@ jobs:
           python3 -m pip install --upgrade pip
           python3 -m pip install pylint
           python3 -m pip install -r ./sdk/python3/requirements.txt
+          python3 -m pip install -e ./sdk/python3/
 
       - name: Analyze python code
         run: |