Bug#1077155: dh-elpa: enable `load-path' handling of sub-directory

[David Bremner <david@tethera.net>]

Xiyue Deng <manphiz@gmail.com> writes:

>
> I have tested running the previously failed tests, e.g. clojure-mode
> which uses buttercup and flycheck which uses both buttercup and ERT, and
> they are now passing using the new implementation.
>

Build failures are (relatively) fine. What I really want to avoid is
having to do a mass rebuild to fix maintainer scripts (or worse, to have
broken maintainer scripts shipped in stable). So we need to take some
extra care and attention with changes to dh-elpa.