Use the existing heuristic to try to check out the right branch, but
then look at the available branches and if we find a stable branch
with the right series name check that out explicitly and use that name
for the branch so that the gerrit queries include the right
patches. This allows us to see patches on stable branches during the
release candidate period, for example.
Change-Id: Ie7a389acb3d912767a8e35dd0dd86053feb7b3d0
Signed-off-by: Doug Hellmann <doug@doughellmann.com>
4d808671b6