[UG] Add `Remove and Redeploy a node` section

This patch:

- adds 2 new articles to the Maintain env section;
- changes the Headings formatting to fit the docs conventions;
- fixes noticed formatting typos.

Change-Id: If016d05bddf05102a5028765e6ffbd9eb259c9df

userdocs/fuel-user-guide/maintain-environment.rst

@@ -14,6 +14,8 @@ This section includes the following topics:
 .. toctree::
    :maxdepth: 1
 
+   maintain-environment/remove-node.rst
+   maintain-environment/redeploy-node.rst
    maintain-environment/access-shell.rst
    maintain-environment/rollback-ug.rst
    maintain-environment/reinstall-node.rst

userdocs/fuel-user-guide/maintain-environment/custom-graph.rst

@@ -1,6 +1,7 @@
 
 .. _custom-graph:
 
+==================
 Run a custom graph
 ==================
 

userdocs/fuel-user-guide/maintain-environment/data-driven.rst

@@ -1,6 +1,7 @@
 
 .. _data-driven:
 
+=====================
 Run data-driven tasks
 =====================
 

userdocs/fuel-user-guide/maintain-environment/deployment-history.rst

@@ -1,6 +1,7 @@
 
 .. _deployment-history:
 
+=======================
 Deployment task history
 =======================
 

userdocs/fuel-user-guide/maintain-environment/deployment-information.rst

@@ -1,6 +1,7 @@
 
 .. _deployment-information:
 
+===============================
 Download deployment information
 ===============================
 

userdocs/fuel-user-guide/maintain-environment/preserve-partition.rst

@@ -1,7 +1,8 @@
 .. _preserve-partition:
 
+====================
 Preserve a partition
-~~~~~~~~~~~~~~~~~~~~
+====================
 
 This section is a part of the :ref:`Rollback a node <rollback-ug>` procedure.
 With partition preservation you can keep any type of data that meets the

userdocs/fuel-user-guide/maintain-environment/redeploy-node.rst

@@ -0,0 +1,38 @@
+.. _redeploy-node:
+
+===============
+Redeploy a node
+===============
+
+Redeploying a node refers to the process of changing the roles that are
+assigned to a node. For example, you want to redeploy some compute and storage
+nodes to be MongoDB nodes.
+
+**To redeploy a node:**
+
+#. Prepare your environment:
+
+   #. Live migrate instances from the compute nodes. For more information,
+      see `Configure migrations <http://docs.openstack.org/admin-guide-cloud/compute-configuring-migrations.html>`_.
+   #. Back up or copy information from the Operating System nodes being
+      redeployed.
+
+#. Log in to the Fuel web UI.
+#. In the :guilabel:`Nodes` tab, select the node(s) that you want to remove
+   and click :guilabel:`Delete`.
+
+   The deployed node will be marked as :guilabel:`PENDING DELETION`.
+
+#. In the :guilabel:`Dashboard` tab, click :guilabel:`Deploy Changes`.
+
+#. Wait for the node to become available in the list of :guilabel:`Discovered`
+   nodes in the :guilabel:`Nodes` tab.
+#. Assign a new role to the node being redeployed.
+#. Adjust the settings of your environment as required.
+#. In the :guilabel:`Dashboard` tab, click :guilabel:`Deploy Changes`.
+#. Wait for the environment to be redeployed.
+
+.. caution:: After redeploying an Operating System node, you will have to
+ manually apply any configuration changes you made and reinstall the software
+ that was running on the node or restore the system from the backup you made
+ before redeploying the node.

userdocs/fuel-user-guide/maintain-environment/reinstall-node.rst

@@ -1,5 +1,6 @@
 .. _reinstall-node:
 
+================
 Reinstall a node
 ================
 

userdocs/fuel-user-guide/maintain-environment/reinstall-virtual-role.rst

@@ -1,7 +1,8 @@
 .. _reinstall-virtual-role:
 
+========================
 Reinstall a virtual role
-------------------------
+========================
 
 If you have the Reduced Footprint feature enabled, you may need to reinstall
 the virtual role.

userdocs/fuel-user-guide/maintain-environment/remove-node.rst

@@ -0,0 +1,28 @@
+.. _remove-node:
+
+=============
+Remove a node
+=============
+
+You may need to remove a node from your environment to replace
+hardware, repair an error, complete maintenance operations, and so on.
+
+**To remove a node:**
+
+#. Log in to the Fuel web UI.
+#. In the :guilabel:`Nodes` tab, select the node that you want to remove and
+   click :guilabel:`Delete`.
+
+   The deployed node will be marked as :guilabel:`PENDING DELETION` and will
+   be removed from the environment after redeployment.
+#. Adjust the settings of your environment as required.
+#. In the :guilabel:`Dashboard` tab, click :guilabel:`Deploy Changes`.
+
+   Puppet removes the node from the configuration files and
+   re-triggers corresponding services.
+
+.. seealso::
+
+ - `Node management commands <http://docs.openstack.org/developer/fuel-docs/userdocs/fuel-user-guide/cli/cli_nodes.html>`_
+ - :ref:`add-nodes-ug`
+ - :ref:`redeploy-node`

userdocs/fuel-user-guide/maintain-environment/rollback-compute-node.rst

@@ -1,7 +1,8 @@
 .. _rollback-compute-node:
 
+=======================
 Rollback a compute node
------------------------
+=======================
 
 You can rollback a compute node to its original state, for example, the state
 before it failed.

userdocs/fuel-user-guide/maintain-environment/rollback-ug.rst

@@ -1,5 +1,6 @@
 .. _rollback-ug:
 
+===============
 Rollback a node
 ===============
 

userdocs/fuel-user-guide/maintain-environment/use-shotgun.rst

@@ -1,6 +1,7 @@
 
 .. _shotgun-ug:
 
+========================================
 Create diagnostic snapshot using shotgun
 ========================================