Without this patch, if this exception is reached, it won't be properly
formed and will result in a log message like this:
Failed to insert replacement values into translated message Could not
find user: %(user_id)s. (Original: 'Could not find user:
%(user_id)s.'): 'user_id'
This patch adds the right parameters to ensure the exception properly
logs the user ID and the translation doesn't fail.
Change-Id: I3229d9a237633cda8f6a25f396a75b8310757d9d
2d26a87229