Hosted repositories only sometimes survive the pull/discover phases right now, due to issues like:

• Pull tries to git clone, but should git init.
• Mercurial doesn't handle empty repositories with on branches.
• SVN tries to connect to an invalid remote.
• None of them set the INIT repo flag correctly, so status doesn't get updated properly in the UI.

Fix all this stuff.

• For each of Git, SVN and Mercurial:
  • Created a new repository from the web UI in a deactivated state.
  • Made it hosted.
  • Manually ran pull/discover.
  • Verified we end up with initialized, empty repositories in consistent states.