Revert "Revert "external services: Change default github.repositoryQu… (!2891) · Merge requests · Administrator / sourcegraph · GitLab

Administrator requested to merge core/set-default-repository-query-to-none into master Mar 21, 2019

Created by: tsenart

This reverts the reverted commit 2da1d2f4493b137bfba43507eb69866f1ff8b915.