Add python unit testing tools

Change-Id: I9e45f1ff420e20f51132815280db4af3a08cba23
diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index dfe66a7..e18dfee 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -124,6 +124,7 @@
         Jinja2 \
         ansible-lint \
         astroid==1.* \
+        coverage \
         docker-compose==1.20.1 \
         docker==3.2.1 \
         gitpython \
@@ -131,6 +132,8 @@
         grpcio-tools \
         isort \
         linkchecker \
+        mock \
+        nose2 \
         pexpect \
         pylint==1.* \
         pyyaml \