Bug 932725 - Add a test to check that the "dial" activity is working

This will fail on master with 
TEST-UNEXPECTED-FAIL | test_sms.py test_sms.TestSms.test_sms_send | TimeoutException: Element #messages-recipients-list span.recipient present but not displayed before timeout
and it's a marionette issue. test_sms.py fails with the same stracktace.

To test this run it on aurora. The locators are the same.