Updated validate.yaml with new parameters and descriptions

- TEST_K8S_NODE - specify k8s node to run tests from
- GENERATE_REPORT - generate html report
- ACCUMULATE_RESULTS - allows to use results from previous builds
- added description to the job parameters

Change-Id: Ib0c6b81112c0546352958efb2e4b9eadf5689a42
1 file changed