Need to call nova.authenticate() to validate credentials.

raise errors when omitted, updated changelog with new modules.

It's the name of the instance, not of an image.

    TASK: [create test controller 0] **********************************************
    failed: [127.0.0.1] => {"failed": true, "parsed": false}
    invalid output was: Traceback (most recent call last):
      File "/Users/jdewey/.ansible/tmp/ansible-1383197329.62-262790004573235/nova_compute", line 1203, in <module>
        main()
      File "/Users/jdewey/.ansible/tmp/ansible-1383197329.62-262790004573235/nova_compute", line 261, in main
        _get_server_state(module, nova)
      File "/Users/jdewey/.ansible/tmp/ansible-1383197329.62-262790004573235/nova_compute", line 197, in _get_server_state
        if server.status != 'ACTIVE':
    AttributeError: 'list' object has no attribute 'status'

Since deletion do not check the type of image or anything,
and since that's tedious to keep track of the image_id and
just adding noise to add image_id for nothing, this commit
just relax the requirement.

    failed: [127.0.0.1] => {"failed": true, "parsed": false}
    invalid output was: Traceback (most recent call last):
      File "/tmp/ansible-1376083321.99-111209413777779/nova_compute", line 1176, in <module>
        main()
      File "/tmp/ansible-1376083321.99-111209413777779/nova_compute", line 239, in main
        _get_server_state(module, nova)
      File "/tmp/ansible-1376083321.99-111209413777779/nova_compute", line 198, in _get_server_state
        private = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if x['OS-EXT-IPS:type'] == 'fixed']
    KeyError: 'OS-EXT-IPS:type'

This extension was added less than 6 month ago, and so cannot be used on a release
older than Grizzly ( like Folsom ).

Commit of the extension : https://review.openstack.org/#/c/21453/

See https://wiki.openstack.org/wiki/ReleaseNotes/Grizzly#Key_New_Features_2

  Migrated all examples: in DOCUMENTATION=''' string to standalone EXAMPLES=''' string
  Added deprecation warning to moduledev.rst and remove deprecated example from it
  Fixed up a few typos and uppercased some acronyms.
  add consistency to how EXAMPLES are formatted