Fix group container config to support dependency

You can't add a dependency to a group container override b/c the parser doesn't split the alias from the container as it does in the container block.

This PR fixes that by running the same code block for dependency splitting used by the container iterator against any dependencies added to a group.

This is a hack and duplicates code, but I'm PR'ing this anyway due to time constraints.  For me, this fixes the issue.