Make error notifications more consistent.

The error notifications sent by wrap_exception are a good source of
information when tracking down errors in the system. It is easy to spot
patterns in the errors by looking at similarities in the exceptions
raised.

This change looks at making the in-line error notifications
follow the same format, so they become equally useful.

Closes-Bug: #1251602
Change-Id: I1cd64a90ecefc64d12af05487eb6e45aa0362d69