os_password was set to None by the novaclient

When creating an instance with V3 API, novaclient sends an empty
os_password to image_cs. This will cause 401(Unauthorized: Invalid
user/password) when trying to find image.

Here is what I did:

nova --debug --os-compute-api-version 3 boot --image cirros-0.3.1-x86_64-uec --flavor m1.nano vm01

REQ: curl -i 'http://10.xxxxxxx:5000/v2.0/tokens' -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "User-Agent: python-novaclient" -d '{"auth": {"tenantName": "demo", "passwordCredentials": {"username": "admin", "password": "openstack"}}}'

RESP: [200] CaseInsensitiveDict({'date': 'Fri, 07 Feb 2014 18:42:11 GMT', 'vary': 'X-Auth-Token', 'content-length': '8759', 'content-type': 'application/json'})
RESP BODY: {"access": {"token": {"issued_at": "2014-02-07T18:42:11.616984", "expires": "2014-02-07T19:42:11Z", "id": "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"endpoints_links": [], "type": "identity", "name": "keystone"}], "user": {"username": "admin", "roles_links": [], "id": "3ae48abcf38449b18dd12162e5fdf683", "roles": [{"name": "admin"}], "name": "admin"}, "metadata": {"is_admin": 0, "roles": ["4ed6b3d5679c4d2f8446b3c5df720dce"]}}}

REQ: curl -i 'http://10.xxx:5000/v2.0/tokens' -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "User-Agent: python-novaclient" -d '{"auth": {"tenantName": "demo", "passwordCredentials": {"username": "admin", "password": ★null}}}'★

RESP: [401] CaseInsensitiveDict({'date': 'Fri, 07 Feb 2014 18:42:11 GMT', 'vary': 'X-Auth-Token', 'content-length': '87', 'content-type': 'application/json', 'www-authenticate': 'Keystone uri="http://10.21.42.98:5000/"'})
RESP BODY: {"error": {"message": "Invalid user / password", "code": 401, "title": "Unauthorized"}}

DEBUG (shell:775) Invalid user / password (HTTP 401)
Traceback (most recent call last):
  File "/opt/stack/python-novaclient/novaclient/shell.py", line 772, in main
    OpenStackComputeShell().main(map(strutils.safe_decode, sys.argv[1:]))
  File "/opt/stack/python-novaclient/novaclient/shell.py", line 708, in main
    args.func(self.cs, args)
  File "/opt/stack/python-novaclient/novaclient/v3/shell.py", line 304, in do_boot
    boot_args, boot_kwargs = _boot(cs, args)
  File "/opt/stack/python-novaclient/novaclient/v3/shell.py", line 77, in _boot
    image = _find_image(cs.image_cs, args.image)
  File "/opt/stack/python-novaclient/novaclient/v3/shell.py", line 1366, in _find_image
    return utils.find_resource(cs.images, image)
  File "/opt/stack/python-novaclient/novaclient/utils.py", line 223, in find_resource
    return manager.get(tmp_id)
  File "/opt/stack/python-novaclient/novaclient/v3/images.py", line 86, in get
    resp, _ = self.api.client._cs_request(url, 'HEAD')
  File "/opt/stack/python-novaclient/novaclient/client.py", line 220, in _cs_request
    self.authenticate()
  File "/opt/stack/python-novaclient/novaclient/client.py", line 352, in authenticate
    auth_url = self._v2_auth(auth_url)
  File "/opt/stack/python-novaclient/novaclient/client.py", line 439, in _v2_auth
    return self._authenticate(url, body)
  File "/opt/stack/python-novaclient/novaclient/client.py", line 452, in _authenticate
    **kwargs)
  File "/opt/stack/python-novaclient/novaclient/client.py", line 213, in _time_request
    resp, body = self.request(url, method, **kwargs)
  File "/opt/stack/python-novaclient/novaclient/client.py", line 207, in request
    raise exceptions.from_response(resp, body, url, method)
Unauthorized: Invalid user / password (HTTP 401)
ERROR: Invalid user / password (HTTP 401)