Provide detailed status information about repository state/progress

Summary:
Replace the blanket "daemons not running" warning with a lot more specific detail, to try to make it easier for users to figure out how to set up repositories correctly.

The next change here will add some additional status information from the daemons, so this panel can report results in greater detail.

Test Plan: See screenshots.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7458