Automatic merge from submit-queue

Fix AssertCalls usage for kubelet fake runtimes unit tests

Despite its name, AssertCalls() does not assert anything. It returns an error that should be checked. This was causing false negatives for a handful of unit tests, which are also fixed here.

Tests for the image manager needed to be rearranged in order to accommodate a potentially different sequence of calls each tick because the image puller changes behavior based on prior errors.

**What this PR does / why we need it**: Fixes broken unit tests

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: 

**Special notes for your reviewer**: 

**Release note**:

```release-note
NONE
```