Handle projects not using stable/ branch names

Projects like stackforge/os-ansible-deployment don't use stable/ in
their supported branches. The branch names, however, do correspond to
the series name on Launchpad. Without these updates, the series needs to
be updated entirely by hand.

Change-Id: I128b48ddfe0eb9a062c796828dded1b8ebb241bf
Closes-bug: 2000150
1 file changed