Update test data with subchart

[jkotiuk]

Update testdata with subchart

Issue #882

[allenporter]

Looks like that reproduces the issue:

>           raise self.exc("\n".join(errors))
E           flux_local.exceptions.HelmException: Command 'helm template nginx ./tests/testdata/cluster9/local-charts/nginx --namespace default --repository-cache /tmp/tmpjmpbvang --repository-config /tmp/tmpns_f8630/repository-config.yaml --registry-config /dev/null --skip-crds --skip-tests' failed with return code 1
E           Error: An error occurred while checking for chart dependencies. You may need to run `helm dependency build` to fetch missing dependencies: found in Chart.yaml, but missing in charts/ directory: nginx_subchart