R1:9ccb3068f879

[conduit: query owners packages by repository]

Summary:
There wasn't an easy way to see all the packages that cover a particular
directory. This adds the option

This is useful to see what's covered within a repo.

Test Plan:
* Queried with a valid repository and path - got the results
as before.
* Queried with a repository and no path - got an error as before.
* Queried with a repository and an asterix as the path - got all the
packages within the repository.

Revert Plan: sure

Other Notes:

Reviewers…