Correct verify job branch selection

The verify job was not picking up the correct branch, as it had been
modeled after the merge jobs, which are single-branch. Also made the
verify jobs more generic, as they had been designed specific to the
eliot project.

Change-Id: I3bacc22bffb89c4b7378c1ada7bd0af988c75a15
Signed-off-by: Eric Ball <eball@linuxfoundation.org>