Merge pull request #18432 from zbraniecki/995425-upgrade-sinon a=tests-only

Bug 995425 - upgrade sinon to 1.9.1 and update API usage. r=julienw
(cherry picked from commit a338645d27c509f064ac3365ca2acc50a08fceb5)

Conflicts:
	apps/costcontrol/test/unit/widget_startup_test.js

(cherry picked from commit 83cae7b7510fc837e27ecd0e298aa462e61f7761)

Conflicts:
	apps/callscreen/test/unit/bluetooth_helper_test.js
	apps/callscreen/test/unit/calls_handler_test.js
	apps/system/test/unit/fxa_manager_test.js