Revert "Move python3-software-properties apt install to baseline.sh"

This reverts commit ba4dc33739d5bbc10af8930c6a5bb075b88888b4.

Change-Id: Ib8245d94075dec98da1cc96e3e5460857d502289
diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index 5af75bc..36857b6 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -37,6 +37,7 @@
         python \
         python-pip \
         python-virtualenv \
+        python3-software-properties \
         rsync \
         ssh \
         zip