Merge pull request #18432 from zbraniecki/995425-upgrade-sinon

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