The httpd service should only be installed on the controller node

At the moment the httpd service is installed on every node. It is
not necessary to install the httpd service on the network, storage,
and compute nodes.

Change-Id: I1656a6679fb9bfc26ef4b59b2e2e28dc7f68a71e
(cherry picked from commit 41c2bdf9b06c5bb90ccb460e5dc070e26bb69e33)
Merge "The httpd service should only be installed on the controller node" into juno