Add Placement service to Minimal deployment for Stein

Placement service installation is removed in nova installation since Stein.
This patch adds Placement service to Minimal deployment for Stein.

Change-Id: Ia91d2abe303ce18f9eb392ca4db2be64df79e1d6
Closes-Bug: #1831822

doc/install-guide/source/openstack-services.rst

@@ -25,6 +25,8 @@ in the order specified below:
   <https://docs.openstack.org/keystone/stein/install/>`_
 * Image service – `glance installation for Stein
   <https://docs.openstack.org/glance/stein/install/>`_
+* Placement service – `placement installation for Stein
+  <https://docs.openstack.org/placement/stein/install/>`_
 * Compute service – `nova installation for Stein
   <https://docs.openstack.org/nova/stein/install/>`_
 * Networking service – `neutron installation for Stein

doc/install-guide/source/overview.rst

@@ -86,11 +86,11 @@ and
 Controller
 ----------
 
-The controller node runs the Identity service, Image service, management
-portions of Compute, management portion of Networking, various Networking
-agents, and the Dashboard. It also includes supporting services such as
-an SQL database, :term:`message queue`, and :term:`NTP <Network Time Protocol
-(NTP)>`.
+The controller node runs the Identity service, Image service, Placement
+service, management portions of Compute, management portion of Networking,
+various Networking agents, and the Dashboard. It also includes supporting
+services such as an SQL database, :term:`message queue`, and
+:term:`NTP <Network Time Protocol (NTP)>`.
 
 Optionally, the controller node runs portions of the Block Storage, Object
 Storage, Orchestration, and Telemetry services.