Booting a test image doesn't work from documentation

THe documentation registers an image with glance with the name
cirros-0.3-x86_64, but the nova boot command attempts to boot
cirros-0.3.0-x86_64.  This results in nova being unable to find
the image in glance with an error such as:

[user@machine ~(keystone_admin)]$ nova boot --image cirros-0.3.0-x86_64 --flavor m1.small --key_name test my-first-server
ERROR: No image with a name or ID of 'cirros-0.3.0-x86_64' exists.

[user@machine ~(keystone_admin)]$ glance image-show cirros-0.3-x86_64
+------------------+--------------------------------------+
| Property         | Value                                |
+------------------+--------------------------------------+
| checksum         | 50bdc35edb03a38d91b1b071afb20a3c     |
| container_format | bare                                 |
| created_at       | 2013-05-15T01:01:54                  |
| deleted          | False                                |
| disk_format      | qcow2                                |
| id               | 4a190ba0-0767-4152-81ce-a6fb4fc52590 |
| is_public        | True                                 |
| min_disk         | 0                                    |
| min_ram          | 0                                    |
| name             | cirros-0.3-x86_64                    |
| owner            | 6d3ba9f84d294238a0f56f4989fbf595     |
| protected        | False                                |
| size             | 9761280                              |
| status           | active                               |
| updated_at       | 2013-05-15T01:01:54                  |
+------------------+--------------------------------------+

This patch documents registering wtih the full x.y.z
version cirros-0.3.0.

Change-Id: I2070d6425d03a99ce11046188d980a30fdf3cde6
Merge "Booting a test image doesn't work from documentation"