[refactor] GosearchCrawler should save subpackages into module field and not new Product.

[timgluz]

Lessons learned from CpanCrawler:
If product has many submodules, then it seriously slows down saving data and the same data is duplicated.

TODO:

Save each subpackage as module in the Product model and also in version model as users may remove submodules between each release.

[timgluz]

Actually, it doesnt work for Golang, because each submodule may include own set of dependencies;

For example, the etcd includes 2 subpackages client and auth. Gosearch api exposes very different set of dependencies for each of them:

• http://go-search.org/view?id=github.com%2fcoreos%2fetcd%2fclient
• http://go-search.org/view?id=github.com%2fcoreos%2fetcd/auth

So, i will close this tasks;