Re-add the missing method for getting repository builds. Add more logging to try to see why some builds are not getting removed from the queue.

data/model.py

@@ -912,6 +912,14 @@ def load_token_data(code):
     raise InvalidTokenException('Invalid delegate token code: %s' % code)
 
 
+def get_repository_build(request_dbid):
+  try:
+    return RepositoryBuild.get(RepositoryBuild.id == request_dbid)
+  except RepositoryBuild.DoesNotExist:
+    msg = 'Unable to locate a build by id: %s' % request_dbid
+    raise InvalidRepositoryBuildException(msg)
+
+
 def list_repository_builds(namespace_name, repository_name,
                            include_inactive=True):
   joined = RepositoryBuild.select().join(Repository)