Merge ~ilasc/launchpad:fix-repack-exception-message into launchpad:master

[Ioana Lasc]

Make repack exception message py3 compatible

[Tom Wardill (twom)]

review: Approve

diff --git a/lib/lp/code/scripts/repackgitrepository.py b/lib/lp/code/scripts/repackgitrepository.py
index 0c25ff6..25e8990 100644
--- a/lib/lp/code/scripts/repackgitrepository.py
+++ b/lib/lp/code/scripts/repackgitrepository.py
@@ -67,7 +67,7 @@ class RepackTunableLoop(TunableLoop):
             except CannotRepackRepository as e:
                 self.logger.error(
                     'An error occurred while requesting repository repack %s'
-                    % e.message)
+                    % e.args[0])
                 continue
             except TransactionRollbackError as error:
                 self.logger.error(