helm 3: dependency update

[bkeroackdsc]

When referring to a chart by chart_repo_path, if it contains dependency references to library charts it will currently fail to install properly.

We should perform the equivalent of helm dependency update prior to attempting an install when the following conditions are met:

1. Chart is API v2 (ie, a Helm 3 chart)
2. Chart has a non-empty dependency list
3. Chart is referenced as a remote chart_repo_path.