Bug 1070731 - [sms] unit test refactoring for new version chai.assert api

test_agent used very old version chai library version=0.5.3
in the current version=1.9.1 deepEqual take prototype into consideration

apps/sms/test/unit/localization_helper_test.js - plain structure
I'd say we can rename this method to smth like ```assertDeepEqual``` and move it to the upper scope so that we don't need to define it twice for Threads and Thread test suites.