Bug 937584 - Modify test_sms_to_dialer.py to use SendSMS atom

Conflicts:
	tests/python/gaia-ui-tests/gaiatest/apps/messages/app.py
Merge pull request #14106 from AndreiH/bug_937584_v1.2

Bug 937584 - Modify test_sms_to_dialer.py to use SendSMS atom