Tag flaky odata test
Tag flaky odata test

```
======================================================================
ERROR: corehq.apps.api.odata.tests.test_metadata:TestDeprecatedFormMetadataDocumentWithTwoFactorUsingApiKey.test_wrong_password
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/vendor/lib/python2.7/site-packages/mock/mock.py", line 1305, in patched
    return func(*args, **keywargs)
  File "/mnt/commcare-hq-ro/corehq/apps/api/odata/tests/test_metadata.py", line 153, in test_wrong_password
    response = self._execute_query(wrong_credentials)
  File "/mnt/commcare-hq-ro/corehq/apps/api/odata/tests/utils.py", line 64, in _execute_query
    return self.client.get(self.view_url, HTTP_AUTHORIZATION='Basic ' + credentials)
  File "/vendor/lib/python2.7/site-packages/django/test/client.py", line 536, in get
    **extra)
  File "/vendor/lib/python2.7/site-packages/django/test/client.py", line 340, in get
    return self.generic('GET', path, secure=secure, **r)
  File "/vendor/lib/python2.7/site-packages/django/test/client.py", line 416, in generic
    return self.request(**r)
  File "/vendor/lib/python2.7/site-packages/django/test/client.py", line 501, in request
    six.reraise(*exc_info)
  File "/vendor/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/vendor/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/vendor/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/vendor/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/vendor/lib/python2.7/site-packages/django/views/generic/base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "/vendor/lib/python2.7/site-packages/django/utils/decorators.py", line 67, in _wrapper
    return bound_func(*args, **kwargs)
  File "/mnt/commcare-hq-ro/corehq/apps/domain/decorators.py", line 199, in safe_fn
    return _inner(request, domain, *args, **kwargs)
  File "/mnt/commcare-hq-ro/corehq/apps/domain/decorators.py", line 411, in _inner
    return fn(request, *args, **kwargs)
  File "/mnt/commcare-hq-ro/corehq/apps/domain/auth.py", line 157, in wrapper
    user = authenticate(username=username, password=password, request=request)
  File "/vendor/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 81, in authenticate
    user_login_failed.send(sender=__name__, credentials=_clean_credentials(credentials), request=request)
  File "/vendor/lib/python2.7/site-packages/django/dispatch/dispatcher.py", line 193, in send
    for receiver in self._live_receivers(sender)
  File "/mnt/commcare-hq-ro/corehq/apps/hqwebapp/signals.py", line 34, in add_failed_attempt
    user.save()
  File "/mnt/commcare-hq-ro/corehq/apps/users/models.py", line 1536, in save
    super(CouchUser, self).save(**params)
  File "/vendor/lib/python2.7/site-packages/couchdbkit/schema/base.py", line 134, in save
    db.save_doc(doc, **params)
  File "/vendor/lib/python2.7/site-packages/couchdbkit/client.py", line 533, in save_doc
    raise ResourceConflict
ResourceConflict:
```

dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq