Followups to finish migration of repo uri -> name

[sqs]

We have deprecated calling the repository name (the value like github.com/foo/bar) the "URI" since April 2018. Now it is just called the repository "name".

There are more things we must do to complete the switch:

• January 2019: remove the GraphQL RepoOrderBy.REPO_URI value from our GraphQL API and make src-cli use REPOSITORY_NAME not REPO_URI

We can't do these until January 2019 per our deprecation policy.

[nicksnyder]

Can we do this for 3.0 or do we need to wait for 3.1?

[keegancsmith]

src-cli unfortunately is still not updated, so we can't remove this until it has had time to roll out. Sent sourcegraph/src-cli#43