Some error notifications are missing exception info

[John Garbutt]

At the moment we are quite inconsistent with some of the error notifications.

Those triggered by the wrappers of compute manager calls are good. However:

* where an instance fault is registered inline, we don't always send an error notification
* where we send an error notification inline, we generally don't send the message and exception information in a consistent way

I am looking to resolve that, so there is more consistency when raising error notifications in the compute manager.

[John Garbutt (johngarbutt)]

see https://review.openstack.org/#/c/56003/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/56003
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=f35c63df24d8f47927d055729e9ca08c7bc3fe8c
Submitter: Jenkins
Branch: master

commit f35c63df24d8f47927d055729e9ca08c7bc3fe8c
Author: John Garbutt <email address hidden>
Date: Sat Nov 9 20:08:37 2013 +0800

    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