Asynchronously clone dev seed repositories during rake db:seed_fu

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Following gitlab-development-kit#171 (closed).

Installing GDK can hang during the 'seed' phase where we clone some example repositories. Looking at https://gitlab.com/gitlab-org/gitlab-ce/blob/master/db/fixtures/development/04_project.rb it seems we use the 'import via URL' feature to fetch these repositories from gitlab.com and github.com.

In normal operation, such imports are done asynchronously by Sidekiq. Could we change the db/fixtures/development/04_project.rb code so that this is also done there?