hosted branches should display sftp information

[David Allouche]

Hosted branches should display information about who can push the branch and how.

At least, hosted branches should display the sftp:// URL a (currently logged in) user can use to push to the branch, for copy-pasting into the command line.

[David Allouche (ddaa)]

Attempt at a complete proposal.

If the user is not logged in, or is not a member of the branch owner:

 * if the branch owner is a person, display a line stating that "Only $owner.browsername can push to that branch."

 * If the branch owner is a team, display a line stating that "Only members of the $owner.name team can push to that branch. This team's membership policy is "$policy". _Join the team_

If the user is logged in and is a member of the branch.owner:

 * Display two lines: "You can use ``bzr push'' to publish changes to that branch." and "*Writable location:* $branch.sftp_url".

[David Allouche (ddaa)]

Rejecting launchpad bug report. The canonical bug report is now the launchpad-bazaar one. I did not realise you could move bug reports across products.

[David Allouche (ddaa)]

FiF branch pending review david/launchpad/branch-upload-directions

[David Allouche (ddaa)]

Fix was comitted, and is now visible on edge.launchpad.net.

[David Allouche (ddaa)]

Been in production for a week.