Automatic merge from submit-queue (batch tested with PRs 49017, 45440, 48384, 45894, 48808) Update two dependencies **What this PR does / why we need it**: github.com/stretchr/testify - main desired update. Old version has bugs. Specifically I encountered https://github.com/stretchr/testify/issues/347 which was fixed a year ago. github.com/davecgh/go-spew/spew is set to the newest version, a bit newer than required by testify. Updated from version 6 Nov 2015 to 27 Jun 2017. github.com/stretchr/objx is not updated - testify uses version from 27 May 2014 which is older than 28 Sep 2015 used now (latest actually). In practice there is only a tiny difference - one method was removed in new version. **Release note**: ```release-note NONE ``` /sig testing
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