The image in our workload templates can altered, but all our tests use the default,

We currently have no way to pass in a different image.

This changes to have a WORKLOADIMAGE in the testrun-cm-template used to create osc-config.

I've changed  TestRunDescription to include the workloadImage. 
createKataPodAnnotated(), createKataPod(), getTestRunConfigmap() are changed to use TestRunDescription.workloadImage
 
All of the test, except 64043-expose-serice deployment, are changed to use testrun.workloadImage