Merge lp://staging/~fginther/ubuntu-ci-services-itself/add-lp-build-logs into lp://staging/ubuntu-ci-services-itself

Pass the completed subticket buildlogs to the lander and have it provide subticket status updates.

Pass the completed subticket buildlogs to the lander and have it provide subticket status updates.

The subticket status updates are already being passed back, the just turns on the lander functionality to update the ticket.

Here's a ticket with the subticket artifacts and progress state updates: http://15.125.114.120/ticket.html?ticket_id=6

While testing this, I ran into lp:1291591. I discovered that the check_ppa code which looks for prior uploads was running *after* the upload_source_packages method which does the dput to the ppa. So it's been pure timing luck that we don't see an upload failure on every ticket. I finally hit case where my new source package made it to the ppa before check_ppa executed.

The fix is fairly simply, split upload_packages.upload_source_packages() into two methods, one to crete the upload list, the other to do the dput and then call check_ppa() in between. This was a smaller fix, so I rolled it into here.