Bug 1109586 - Write test to check the Contacts App checks and notifies t...

...he user when no network is available during a import contacts app
Could we use the [is_wifi_connected][link] method and avoid the wifi enable-forget-disable scenario?

[link]:https://github.com/mozilla-b2g/gaia/blob/master/tests/python/gaia-ui-tests/gaiatest/gaia_test.py#L324