[install] Add optional m1.nano flavor

Add optional m1.nano flavor that only requires 64 MB memory
per instance for environments with limited resources.

Change-Id: I7338a5d7e6dd5268462b062581cfa20c646ef398
Implements: bp installguide-mitaka

doc/install-guide/source/launch-instance-provider.rst

@@ -34,7 +34,8 @@ name, network, security group, key, and instance name.
       | 5  | m1.xlarge | 16384 |  160 |         0 |     8 | True      |
       +----+-----------+-------+------+-----------+-------+-----------+
 
-   This instance uses the ``m1.tiny`` flavor.
+   This instance uses the ``m1.tiny`` flavor. If you created the optional
+   ``m1.nano`` flavor, use it instead of the ``m1.tiny`` flavor.
 
    .. note::
 

doc/install-guide/source/launch-instance-selfservice.rst

@@ -34,7 +34,8 @@ name, network, security group, key, and instance name.
       | 5  | m1.xlarge | 16384 |  160 |         0 |     8 | True      |
       +----+-----------+-------+------+-----------+-------+-----------+
 
-   This instance uses the ``m1.tiny`` flavor.
+   This instance uses the ``m1.tiny`` flavor. If you created the optional
+   ``m1.nano`` flavor, use it instead of the ``m1.tiny`` flavor.
 
    .. note::
 

doc/install-guide/source/launch-instance.rst

@@ -36,6 +36,33 @@ networks.
 After creating the appropriate networks for your environment, you can
 continue preparing the environment to launch an instance.
 
+Create m1.nano flavor
+---------------------
+
+The smallest default flavor consumes 512 MB memory per instance. For
+environments with compute nodes containing less than 4 GB memory, we
+recommend creating the ``m1.nano`` flavor that only requires 64 MB per
+instance. Only use this flavor with the CirrOS image for testing
+purposes.
+
+.. code-block:: console
+
+   $ openstack flavor create --id 0 --vcpus 1 --ram 64 --disk 1 m1.nano
+   +----------------------------+---------+
+   | Field                      | Value   |
+   +----------------------------+---------+
+   | OS-FLV-DISABLED:disabled   | False   |
+   | OS-FLV-EXT-DATA:ephemeral  | 0       |
+   | disk                       | 1       |
+   | id                         | 0       |
+   | name                       | m1.nano |
+   | os-flavor-access:is_public | True    |
+   | ram                        | 64      |
+   | rxtx_factor                | 1.0     |
+   | swap                       |         |
+   | vcpus                      | 1       |
+   +----------------------------+---------+
+
 Generate a key pair
 -------------------