List both hosted and observed repositories in "Cluster Repository Status" configuration console

Summary:
When I wrote this the first time, only hosted repositories could be clustered.

This check wasn't removed when I allowed observed repositories to be clustered in D15986.

Test Plan:
Reloaded Config → Repository Servers page, saw more stuff locally.

Reviewed the cardinal digits between 1 and 17, inclusive.

Reviewers: chad, avivey

Reviewed By: avivey

Differential Revision: https://secure.phabricator.com/D16392