EC2 API hides exceptions from the user. (volumes)

[Chuck Short]

Without looking at the log files users cant really figure out what is going on when attaching/deleting/creating volumes fail. While running against euca2ools you very often get the following response back from the server:

chuck@homer:~/work/server/openstack/devstack/devstack$ euca-delete-volume vol-4
UnknownError: An unknown error has occurred. Please try your request again.
chuck@homer:~/work/server/openstack/devstack/devstack$

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/5082

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/5082
Committed: http://github.com/openstack/nova/commit/5f217aa13254c27bc52f43088fefd2116f77fb3c
Submitter: Jenkins
Branch: master

commit 5f217aa13254c27bc52f43088fefd2116f77fb3c
Author: Chuck Short <email address hidden>
Date: Thu Mar 8 11:42:53 2012 -0500

    Make EC2 API a bit more user friendly.

    Inform users that volume operations have failed.
    Fixes bug 950055.

    Change-Id: Ia33965031495e03e539e3c7ce2fbbda8ef48b5e5
    Signed-off-by: Chuck Short <email address hidden>