Change defaults for kubernetes upgrade job

- Default creds changed to 'salt'
- Images in most places replaced to binaries and hashes
- Binaries default made nullable to avoid incorrect trigger
attempt for override salt params on prod envs.
- DOCKER_UPGRADE param is removed in favor of
ContainerD migration.

Change-Id: Idebf857eca3073e13b316e73c736dca09afc19ed
Related-PROD: PROD-26583 (PROD:26583)
1 file changed