Automatic merge from submit-queue

delete cadvisor pod after test

tracing looks at events for pod deletion and volume teardown.  SInce the cadvisor pod has more than 1 volume, this can make results harder to analyze.
This PR moves the deletion of the cadvisor pod to after the logPodCreateThroughput call, since that marks the "end" of the test.

cc: @dchen1107 @Random-Liu