Raise InvalidInput directly instead of catch it

[Alex Xu]

In quantum.api.v2.base._filters, we catch exception 'InvalidInput' and raise it as 'HTTPBadRequest'.

But we have mapping 'exceptions.InvalidInput: webob.exc.HTTPBadRequest' in quantum.api.v2.base.FAULT_MAP.

So we should raise InvalidInput directly.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/18682

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/18682
Committed: http://github.com/openstack/quantum/commit/c536aab7e2bd5af4dafa37b22b4a9972d7e7b2bc
Submitter: Jenkins
Branch: master

commit c536aab7e2bd5af4dafa37b22b4a9972d7e7b2bc
Author: He Jie Xu <email address hidden>
Date: Thu Dec 27 21:31:34 2012 +0800

    Raise InvalidInput directly instead of catch it

    Fixes bug 1094023

    Change-Id: I960b01996e33da0da5e9cd181479ebcf70d38997