[cli-ref] consolidate server-side commands

To add more server-side commands, reorganize the section structure.

Change-Id: Id44a1e74c5ed6b1b128b16c797e59a5941ab3b51

doc/cli-reference/source/database.rst

@@ -0,0 +1,9 @@
+=====================================
+Database service command-line clients
+=====================================
+
+.. toctree::
+   :maxdepth: 1
+
+   trove
+   trove-manage

doc/cli-reference/source/index.rst

@@ -15,33 +15,31 @@ Contents
 .. toctree::
    :maxdepth: 1
 
-   common/conventions.rst
-   overview.rst
-   openstack.rst
+   common/conventions
+   overview
+   openstack
 
-   murano.rst
-   ironic.rst
-   cinder.rst
-   senlin.rst
-   compute.rst
-   magnum.rst
-   sahara.rst
-   trove.rst
-   trove-misc.rst
-   designate.rst
-   glance.rst
-   barbican.rst
-   monasca.rst
-   neutron.rst
-   neutron-misc.rst
-   swift.rst
-   heat.rst
-   cloudkitty.rst
-   manila.rst
-   solum.rst
-   ceilometer.rst
-   gnocchi.rst
-   mistral.rst
+   murano
+   ironic
+   cinder
+   senlin
+   compute
+   magnum
+   sahara
+   database
+   designate
+   glance
+   barbican
+   monasca
+   networking
+   swift
+   heat
+   cloudkitty
+   manila
+   solum
+   ceilometer
+   gnocchi
+   mistral
 
 Appendix
 ~~~~~~~~
@@ -49,7 +47,7 @@ Appendix
 .. toctree::
    :maxdepth: 1
 
-   common/app_support.rst
+   common/app_support
 
 Glossary
 ~~~~~~~~
@@ -57,7 +55,7 @@ Glossary
 .. toctree::
    :maxdepth: 1
 
-   common/glossary.rst
+   common/glossary
 
 Search in this guide
 ~~~~~~~~~~~~~~~~~~~~

doc/cli-reference/source/networking.rst

@@ -0,0 +1,10 @@
+=======================================
+Networking service command-line clients
+=======================================
+
+.. toctree::
+   :maxdepth: 1
+
+   neutron
+   neutron-debug
+   neutron-sanity-check

doc/cli-reference/source/neutron-misc.rst

@@ -1,11 +0,0 @@
-.. This file is manually generated, unlike many of the other chapters.
-
-============================================
-Networking miscellaneous command-line client
-============================================
-
-.. toctree::
-   :maxdepth: 2
-
-   neutron-debug
-   neutron-sanity-check

doc/cli-reference/source/trove-misc.rst

@@ -1,10 +0,0 @@
-.. This file is manually generated, unlike many of the other chapters.
-
-==================================================
-Database service miscellaneous command-line client
-==================================================
-
-.. toctree::
-   :maxdepth: 2
-
-   trove-manage