installing kafkacat on basebuilds

Change-Id: Ia08cc2d5155def2db530cfe462b8d36c2733b1d9
diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index f16ae90..7cd3988 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -97,6 +97,7 @@
         golang-1.10-go \
         httpie \
         jq \
+        kafkacat \
         "kubeadm=1.12.4-*" \
         "kubelet=1.12.4-*" \
         "kubectl=1.12.4-*" \