Fix Debian install (remove Debconf)
Fix Debian install (remove Debconf)

Since the Debconf stuff is moved to a separate guide, do like
for keystone: remove the conditionals, and set it closer to
what's done in Ubuntu.

Change-Id: Id2ada6f35a1bbd0337eca6a8165013f7eab655d2

AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals