[ci] Call pip2/3 using sudo (#150)

Call pip2/3 using sudo to ensure packages are installed globally.

Author: jleveque

azure-pipelines.yml

@@ -79,10 +79,10 @@ jobs:
 
       - script: |
           set -xe
-          pip2 install swsssdk-2.0.1-py2-none-any.whl
-          pip2 install sonic_py_common-1.0-py2-none-any.whl
-          pip3 install swsssdk-2.0.1-py3-none-any.whl
-          pip3 install sonic_py_common-1.0-py3-none-any.whl
+          sudo pip2 install swsssdk-2.0.1-py2-none-any.whl
+          sudo pip2 install sonic_py_common-1.0-py2-none-any.whl
+          sudo pip3 install swsssdk-2.0.1-py3-none-any.whl
+          sudo pip3 install sonic_py_common-1.0-py3-none-any.whl
         workingDirectory: $(Pipeline.Workspace)/target/python-wheels/
         displayName: 'Install Python dependencies'