GKE's stable K8s version is now 1.19. Also adding VAULT_LICENSE_CI to
the `make test-acceptance` target to make it easier to run the
acceptance tests manually, and mentioned it in the test README.
* Default to hashicorp/vault for vault agent image.
* Add support for running acceptance tests against a kind cluster
* make the injector-leader-elector a bit more reliable when run locally
Generated the schema using the helm schema-gen plugin, and added extra
data types to fields that allow it, such as annotations, tolerations,
enabled, etc. Enabled the "contains-value-schema" chart-verifier test.
Co-authored-by: Jason O'Donnell <2160810+jasonodonnell@users.noreply.github.com>
