Config Reference: Initial Sahara chapter

Add initial chapter documenting Data processing service options.

Change-Id: Id484d8f794230ebf642d57d8e30a8d5a17dc3841

doc/config-reference/bk-config-ref.xml

@@ -132,6 +132,8 @@
     <xi:include href="ch_dashboardconfigure.xml"/>
     <!-- Database Service -->
     <xi:include href="ch_databaseserviceconfigure.xml"/>
+    <!-- Data processing service -->
+    <xi:include href="ch_dataprocessingserviceconfigure.xml"/>
     <!-- Identity -->
     <xi:include href="ch_identityconfigure.xml"/>
     <!-- Image -->

doc/config-reference/ch_dataprocessingserviceconfigure.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<chapter xmlns="http://docbook.org/ns/docbook"
+  xmlns:xi="http://www.w3.org/2001/XInclude"
+  xmlns:xlink="http://www.w3.org/1999/xlink"
+  version="5.0"
+  xml:id="ch_configuring-sahara">
+  <title>Data processing service</title>
+  <para>
+    The Data processing service (sahara) provides a scalable
+    data-processing stack and associated management interfaces.
+  </para>
+
+  <para>The following tables provide a comprehensive list of the
+      Data processing service configuration options.</para>
+
+      <xi:include href="../common/tables/sahara-amqp.xml"/>
+      <xi:include href="../common/tables/sahara-auth_token.xml"/>
+      <xi:include href="../common/tables/sahara-common.xml"/>
+      <xi:include href="../common/tables/sahara-database.xml"/>
+      <xi:include href="../common/tables/sahara-debug.xml"/>
+      <xi:include href="../common/tables/sahara-logging.xml"/>
+      <xi:include href="../common/tables/sahara-qpid.xml"/>
+      <xi:include href="../common/tables/sahara-rabbitmq.xml"/>
+      <xi:include href="../common/tables/sahara-redis.xml"/>
+      <xi:include href="../common/tables/sahara-rpc.xml"/>
+      <xi:include href="../common/tables/sahara-zeromq.xml"/>
+
+</chapter>