fix astroid module to 1.x version as 2.x is Python 3 only

Change-Id: If5066f5aa1bab9637772033f936cb652a53f198b
diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index e05bfff..4c0084e 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -81,7 +81,7 @@
     pip install \
         Jinja2 \
         ansible-lint \
-        astroid \
+        astroid==1.* \
         docker-compose==1.20.1 \
         docker==3.2.1 \
         gitpython \