- Refactor helm installer to use a single meta chart install job
install job and config which use Helm v3 client.
- Use upstream helm client binary instead of using helm-client container
maintained by us. To verify checksum, helm_client_sha256 label is
introduced for helm_client_tag (or alternatively for URL specified
using new helm_client_url label).
- Default helm_client_tag=v3.2.1.
- Default tiller_tag=v2.16.7, tiller_enabled=false.
Story: 2007514
Task: 39295
Change-Id: I9b9633c81afb08b91576a9a4d3c5a0c445e0cee4