CORD-1441
Install Apache proxy and ElasticStack during physical pod install

Change-Id: I5b16d8916a59baaef41a9b03fe45b3d7126896b0
diff --git a/prep-platform-playbook.yml b/prep-platform-playbook.yml
index d2f9943..d6367f6 100644
--- a/prep-platform-playbook.yml
+++ b/prep-platform-playbook.yml
@@ -33,3 +33,4 @@
     - pki-install
     - { role: cloudlab-prep, when: on_cloudlab }
 
+- include: deploy-elasticstack-playbook.yml