I tried setting country to ``United States`` but it opens the country selection and fails on this error. Indeed, United States is not in the drop down but if I select another country and go back I see it.

```
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ERROR: test_marketplace_purchase_app (test_marketplace_purchase_app_wifi.TestMarketplacePurchaseApp)
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Traceback (most recent call last):
  File "/Users/kumar/dev/gaia-ui-tests/gaiatest/tests/marketplace/test_marketplace_purchase_app_wifi.py", line 63, in test_marketplace_purchase_app
    network=self.testvars['carrier']['network'],)
  File "/Users/kumar/dev/gaia-ui-tests/gaiatest/apps/bango/app.py", line 102, in make_payment_wifi
    self.select_country(country)
  File "/Users/kumar/dev/gaia-ui-tests/gaiatest/apps/bango/app.py", line 173, in select_country
    country_select = self.marionette.find_element('link text', value)
  File "/Users/kumar/.virtualenvs/gaia-ui-tests/lib/python2.7/site-packages/marionette_client-0.5.27-py2.7.egg/marionette/marionette.py", line 625, in find_element
    response = self._send_message('findElement', 'value', **kwargs)
  File "/Users/kumar/.virtualenvs/gaia-ui-tests/lib/python2.7/site-packages/marionette_client-0.5.27-py2.7.egg/marionette/marionette.py", line 344, in _send_message
    self._handle_error(response)
  File "/Users/kumar/.virtualenvs/gaia-ui-tests/lib/python2.7/site-packages/marionette_client-0.5.27-py2.7.egg/marionette/marionette.py", line 365, in _handle_error
    raise NoSuchElementException(message=message, status=status, stacktrace=stacktrace)
TEST-UNEXPECTED-FAIL | test_marketplace_purchase_app_wifi.py TestMarketplacePurchaseApp.test_marketplace_purchase_app | NoSuchElementException: Unable to locate element: United States
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```