Exceptions in quantumclient are inconsistently defined

[Maru Newby]

As per the suggestions in the following review:

https://review.openstack.org/#/c/6450/1/quantumclient/common/exceptions.py

 - Merge QuantumClientException with QuantumException
 - Ensure that all exceptions define a default message
 - Remove the 'Client' qualifier from the name of all exceptions

[dan wendlandt (danwent)]

Yong, can you comment on whether this still matters with the new version of the client? If so, we can keep it, otherwise, please mark as invalid.

[yong sheng gong (gongysh)]

Yes. we can keep it.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/24333

[Roman Podoliaka (rpodolyaka)]

Changing of exceptions names in quantumclient breaks corresponding imports in Horizon. So we should update both projects.

[Mark McClain (markmcclain)]

I'd hold off on making these changes. The 3.0.0 version is a significant change and we should update Horizon once.

[Roman Podoliaka (rpodolyaka)]

Sure. Should this bug be attached to milestone 3.0.0?

[Akihiro Motoki (amotoki)]

It was superceded by bug 1296148 which was released.