Add tabular python lib to preriquisites

test/ci-bootstrap.py

@@ -3,9 +3,11 @@
 Used by CI to bootstrap a new cluster and run tests.
 
 Prerequisites
-- ansible > 2.2 (at least stretch-backports needed)
-- ansible-runner python module
-- python3 requests lib
+- Ansible > 2.2 (at least stretch-backports needed)
+- External python3 libraries:
+  - ansible-runner
+  - requests
+  - tabulate
 
 Env vars needed:
 - COSMOS_API_TOKEN
@@ -13,7 +15,7 @@ Env vars needed:
 
 In Debian:
     apt-get install -y --no-install-recommends ansible gcc libc6-dev
-    pip3 install ansible-runner requests
+    pip3 install ansible-runner requests tabulate
 """
 
 import ansible_runner